Did Life on Earth Come from Space?


what if the first genesis of life the
abiogenesis is so unlikely that it only happened once in the entire galaxy and
that once was not on earth what if primitive life arrived on earth
after having traveled vast distances across the Milky Way some scientists
think this may be the case this is the panspermia hypothesis there’s something
odd about the first appearance of life There’s something odd about the first appearance of life on earth. The oldest fossils are now dated to only a few hundred million years after the moment earth first
became habitable is it really reasonable to imagine that evolution turned an
unliving chemical soup into the first true living cells in that geological
eyeblink well maybe but it’s also possible that
life on Earth didn’t start on earth at all perhaps it started on a distant
world somewhere in the Milky Way and somehow survived a long journey through
the void to colonize the early Earth the plausibility of panspermia comes down to
whether or not any living organism can survive it’s three deadly stages
ejection from an origin world traveled to the new world the entry to that
world’s biosphere let’s start with the exciting parts the beginning and the end
of the journey one way for a budding microbial astronaut to travel the Stars
is via Luther panspermia basically be attached to a rock that travels between
planets now we know that debris from planetary surfaces can be ejected into
space during asteroid or comet impacts hundreds of meteorites have been found
on earth that have compositions suggesting they originated from the Moon
or Mars many chunks of Earth have also been ejected into space most of them
from the largest impacts like the one that killed the dinosaurs some of that
debris would have contained life but could hitchhiking microbes have survived
that ejection to escape Earth’s gravitational field a chunk of impact
debris has to be
kicked to a minimum of eleven point two kilometers per second that’s the escape
velocity at Earth’s surface that requires an acceleration of up to
hundreds of thousands of GS and hundreds of thousands of Earth atmospheres in
shock pressure similar forces apply when it smacks down at the other end of the
journey temperatures in these rocks can rise to several hundred Kelvin in the
impacts and during reentry that all sounds pretty unsurvivable but
scientists have engaged in various forms of microbe abuse to test this this
includes shooting high-velocity projectiles loaded with colonies
spitting them up in an ultracentrifuge attempting to splat colonies with
extreme pressure in back plates and if that’s not realistic enough microbe
laced rocks have been dropped from space strapped to the outside of reentry
vehicles many life forms have been tested from corn bacteria that you find
everywhere in the soil to primitive cyanobacteria to heat resistant
extremophiles and even fungus spores and lichens while survival rates may be low
at least a small fraction of bugs of any of these types can survive the pummeling
of high pressure acceleration exposure to extreme temperature for example in
atmospheric reentry is more problematic some extremophiles can survive at
temperatures above a hundred Celsius but the surfaces of rocks during impact or
reentry will be much much hotter than this and this is where we identify our
first microbial contender for panspermia endoliths these are organisms that live
deep within rocks deep enough that they’re protected from the extremes of
temperature change as we’ll see endoliths are exceptional candidates as
micro cosmonauts for a number of reasons they may also be the only critters that
can actually survive the journey between planets but before we talk about the
hazards of that journey let’s look at a gentler mechanism for getting life into
space a wide variety of living single-celled organisms are found
floating around in the atmosphere as high as the stratosphere some of this
material may make it into space just this year Russian cosmonauts
reported the discovery of familiar bacterial DNA on the outer surface of
the International Space Station they suggested rowed electrical currents from
the atmosphere below or it came from space probably the former though these
levitating microbes have a gentler journey up and they may also have a
faster trip to their destination very small individual bacteria can be
accelerated by their star’s own radiation and be ejected from the solar
system this is Radio panspermia stars may be constantly spraying their
germy life through the galaxies in some respects it sounds like levitating into
space and becoming your own solar sail is way more efficient than Luthor
panspermia except for one thing the vicious
environment of space probably annihilates all microbes not
surrounded by a nice big spaceship made of rock getting up and down again from
space is the fun part but for a budding panspermia life-form the journey itself
you simultaneously the most boring and the most lethal our pilgrim microbes
have to contend with near absolute zero temperatures extreme dryness
a hard vacuum and probably worst of all some incredibly destructive radiation
for up to millions of years so can they do it the best way to simulate the
conditions of space travel is to send things to space the first experiment was
way back in 1936 when fungal spores were sent on a stratospheric balloon ride
since then every potential Pants permeating life-form has taken rides on
various satellites most notably the International Space Station it’s mostly
single-celled organisms and spores but also tardigrades and nematodes some of
these tests were actually to test survivability on Mars but the results
Trane’s and in some the results are clear many
bugs can survive the vacuum freezing cold microgravity and absolute dryness
of space but radiation is a problem we’ll come back to that when protected
from radiation various bacteria fungi lichens archaea and viruses have been
revived after months of exposure to the cold dry microgravity of the vacuum in
some cases it’s after six years even the tardigrade everyone’s favorite extremely
philic multicellular teddy bear can revive after exposure to space
the key is cryptobiosis many life-forms can enter or produce a hibernating form
that’s incredibly resistant to adverse conditions in particular life-forms that
could survive extreme dryness and hydro biotic life-forms do especially well
that includes certain reproductive spores especially of fungi but also
critters can enter an N hydro biotic state they dry out shrivel up and wait
out the bad conditions tardigrades are an amazing example of
this but the real champions are endospores this is a hibernation state
that many bacteria enter when deprived of the needful conditions for life they
generate a protective wall shrink down stabilize their DNA and essentially shut
off all metabolism they don’t need water air or nutrients and are remarkably
resistant to radiation damage or DNA decay bacterial endospores have been
rejuvenated after up to six years exposure to the cold and vacuum of space
there are reports of viable endospores found on earth and dated to millions of
years perhaps even a couple of hundred million years plenty long enough to make
an interstellar journey the real challenge is radiation solar ultraviolet
radiation in space can reach a hundred million times the UV intensity of sea
level this will typically completely destroy any unprotected microbe in a
fraction a second DNA molecular machinery and
cell walls are shredded by ultraviolet light tardigrades and bacterial spores
are somewhat resistant the latter if they are in layered colonies
photosynthetic cells like cyanobacteria and lichens can also survive direct
sunlight in low Earth orbit briefly mortality is still high in all of these
like and seem to do the best with cell surviving up to several months of
exposure but probably not for years a star’s intense UV radiation probably
rules out radio panspermia only the tiniest microbes probably bacterial
spores are light enough to be accelerated by a star’s light and those
things are likely destroyed before they can get far enough from their home star
anyway even far from the intense UV radiation of a star interstellar space
is thick with energetic cosmic rays near light speed atomic nuclei as well as
x-rays and gamma rays endospores are somewhat resistant to cosmic rays but
there is a limit the only true protection is a thick wall of solid
material once again we’re back to impact ejecta and litho panspermia microbes
buried deep enough in rock are entirely safe from UV and safe from cosmic rays
if deep enough endoliths natural rock dwelling organisms have representatives
in all domains of The Tree of Life they are often extremophiles and their
resilience often translates to the conditions of space they also have
exceptionally low metabolisms with some having reproduction rates of decades to
centuries or perhaps even millions of years there are endo lytic bacteria
viruses and fungi dug out from deep beneath the ocean floor that appear to
be a couple hundred million years old if anything can travel between the stars
it’s these guys okay to review many microbial life forms can survive the
journey into and out of space endoliths can survive long space journeys buried
in rock can they really make it to another
planet and is it ever likely to happen I mean statistically let’s start with the
easy journey within a solar system like Mars to earth the minimum travel time
for a Martian impact ejector to get to earth is something like six months
although it’s more likely to take years or centuries given the random nature of
the journey those timescales are totally reasonable
for the more hearty earth microbes traveling between solar systems is a
whole different game first the rock has to escape not just from the planets
gravitational field but its stars field also to get a microbe from the surface
of the earth to interstellar space requires a large velocity around four
times what is needed to just escape the earth that rock would endure a
commensurately higher acceleration to attain that speed with all the pressure
and temperature pain that went with it once an infested Rock makes it out of
the solar system it has a very long very boring journey ahead to get to the
nearest stars a rock traveling at the sun’s galactic orbital speed of 30 km/s
would take several tens of thousands of years but real panspermia expeditions
likely take much longer there’s only a tiny chance that an interstellar rock
will be caught in the gravitational field of any given star that it passes
take uma or more for example the asteroid that zipped through our solar
system in 2017 it’s going to escape our solar system and this was probably the
closest encounter it had for hundreds of millions of years some life-forms may be
able to hibernate that long but at this point the issue is just frequency of
impacts is it at all likely that a microbe bearing rock from another star
system hit the earth in the short time it took life to take hold well it
depends on the abundance of life in the galaxy but it seems dubious one
interesting alternative possibility is that life bearing rocks aren’t so often
captured by planetary systems but rather by the giant deceived
and gas that precede the formation of planets circled protoplanetary disks
these could act like gigantic nets to capture break apart and disperse the
seeds of life before a solar system even forms star fairy microbes could then
remain in hibernation into a planets coalesce from the protoplanetary disk
and one of these life bearing rocks slams into a newly habitable world
perhaps the most convincing argument against panspermia is that if the
dormant seeds of life are so common throughout the galaxy why haven’t many
of the forty billion earth-like planets produced technological civilizations far
in advance of us and speaking of aliens a fun version of this idea is directed
panspermia in which the seeds of life are sent out deliberately to engineer
life across the galaxy they would actually be pretty easy for a moderately
advanced civilization but aliens aside panspermia is a plausible but by no
means accepted explanation for the origin of life on Earth if it’s true
then you me and everyone you know is an alien a genetic immigrant from another
world perhaps with many cousins scattered
across the galactic reaches of space time before we get to comments I am very
pleased to announce today’s episode is brought to you by our brand new
space-time merch store we have all new nerd tastic t-shirts mugs hats posters
and even a baby onesie we’ll be updating the store with even more merchants
coming weeks so make sure you check out PBS space time comm in the last episode
we talked about the interstellar space rock boom or more and the proposition by
some astronomers that it may be an alien light sail I laid out the case why this
is very unlikely and I asked you guys what you thought about the out waited
attention the media gives to these sorts of Fringe ideas regardless of their
connection to reality is it harmful or is any public exposure to science good
it seems that you did think about it and quite hard justin o’brien places the
responsibility on the media stating the problem is the
rampant lack of journalistic integrity that problem exists wherever a
journalist is looking for fame and its trappings and when a media is slave to
advertiser demands well this is definitely a factor when both the media
outlet and the writer live or die by that month’s clicks it’s easier to lose
sight of old-fashioned journalism or to make the necessary sacrifices to pay the
rent hmm hard to say whose fault that is
advertisers editors journalists mindless market forces or the viewer for
insisting on free content which brings us back to advertisers guest who puts it
well and I quote when the media says Harvard scientist says X this is
received effectively as a pronouncement of truth from scientists when it is
inevitably proven false or the predicted thing doesn’t eventuate the public
naturally learns not to trust in science as a whole even casting doubt on all
established science as well Ian Oksana made similar points also adding that
it’s harmful of scientists or communicators do not qualify their
fringe ideas with notes of caution otherwise it gives the public a
distorted view of how science works and a related point Steve Zara says that
exaggerations and hype are harmful because they encourage excitement about
the wrong things Sam Winfield agrees saying that hype
over nothing leads directly to disinterest they are crying wolf all
good points if the press only emphasizes the most outlandish interpretations do
we eventually get bored by the real universe give kids too much candy and
they won’t eat their vegetables in this case umemura is totally amazing as our
first natural interstellar visitor and the glory belongs to those who
discovered and unlocked its real properties seems a bit cheap for someone
to come swooping in and shout aliens every time something inexplicable is
observed and we have at least one counterpoint mark gibble says that no
it’s probably not harmful at least in this case as long as we have people to
bring rationality to the dreamers and the skeptics alike it’s a proud Duty we
have here at PBS space time squashing dreams and killing the buzz since 2015
heartbreak one changes the subject pointing out that if aliens were to land
on PBS studios we would do a lot of biological testing and determine that
most probably it isn’t aliens wait are you disparaging our ability to
biologically test aliens or are you saying we’d lie about it if we found out
that there were aliens I assure you I will be the first on the alien bandwagon
and when the evidence is clear so you know how to be sure Italians no fun
buzzkill skeptics like us will be saying it too although a few of you point out
that denying that the murmur is aliens is just what aliens would say, or go we are
aliens well to deny that would make me even more of an alien so I guess you got
me

Comments 100

  • A question that can't be answered without finding another life beyond earth. If found life is DNA based and has very similar metabolism to earth based life, then panspermia is most likely correct. In earth without exception every life form has same basic metabolism. Unless it is related to earth based life via panspermia, an alien life is expected to have completely different chemistry and metabolism.

  • One-ish discernable woman among the listed patreons. Why?

  • panspermia is the sloppiest scientific theory ever..

  • Everything comes from space, compacted into itself, it will eventually progress into something based of the elements combined into its contained area.

  • https://www.scribd.com/document/398674530/Spallation-Theory-Eddie-Maalouf-013019-Revised

    Spallation theory describes at the quantum level how primordial hydrogen isotopes (protium) are converted and eventually evolve into animate cells. Using Ultra-excited Neutrinos and gamma rays everywhere in the universe where conditions are met (goldilocks zones)… Life does not have to travel between worlds. Stars and their constituents are the key.

  • Another waste of talent and time. My God I hate the unpractical, wanton meandering that the scientific community gets bogged down with. Life is here , move on to furthering your species!!!!

  • My name is Kent Hovind, and life did not come from rocks. Evolution is the most stupidest idea ever created by men. Hovind's theory is God created everything… deal with it. Try to prove Hovind's theory wrong.

  • Why would the organism have to still be alive to spread life. If only bits and pieces of DNA/RNA were to complete the journey, couldn't that be enough to kick start evolution where they finally came to rest???

  • you look blury in your videos (I have just watched a few anyway….)

  • (0:37) "The oldest fossils are now dated to only a few hundred million years after the moment Earth first became habitable."

    Would that be before or after the early Earth was struck by Theia, the Mars-sized rock theorized to have crashed into the Earth and caused the formation of our Moon?

  • They seem to wonder why there is no advanced life in our galaxy when we haven't checked all of it yet. And how much of our galaxy have we checked yet? Well, on a cosmic scale, hardly any. So there's a possible answer, we haven't really looked yet, we'll have to wait another 75,000 years before we will ever know.

  • The get over the solar escape velocity problem, could it have been possible for a bacteria infested planet to been blown apart during a starts dying explosion. That would send millions of life covered rocks in an expanding spherical cone away from the point of origin. I understand that the sudden acceleration would cause a significant and sudden increase Gs, and the radiation levels would be exceptionally high, but could this be a possibility?

  • This is where science and religion and cultural beliefs meet in regard to where we come from… We have always been, and will always be. And everything is connected. Call it God, Gaia or Spiritual Connection, it's all the same. As of right now, we lack the mental comprehension of where we came from and where we will end up!

  • panspermia reminds me of the movie body snatchers. If life came from somewhere else then couldn't a virus that kills us all also come from space?

  • Life comes from transition zones where outside influences repeat and change molding like clay the building blocks of life by repetitive changes creating bariers of chemicals that might only repel each other like oil and water. Other matter might add density and other attributes. Given enough time in non stagnant conditions life is likely to exist, survive, and thrive.

  • Evolution starts after abiogenesis, the process of nonliving matter becoming life IS NOT a product of evolution….I expected better from PBS space time

  • The 'panspermia' argument/hypothesis is irrelevant to the origin of life really. If some early form of life wafted in our direction, then the problem of discovering the origin of life (or 'abiogenesis') is just pushed back one further stage. It's a vague possibility; but that's about all really.

  • The lengths of hopeful speculation people will go to in order to avoid creation is incredible

  • Panspermia…
    I've pondered about this a lot. I just didn't know there was an actual term for it.
    Great discussion!

  • Would the issue with escape velocity be solved if the planet had exploded or star gone nova?

  • Life on earth originated on Mars. It takes 2 planets in the habitable zone to have enough time using both worlds to evolve life to an intelligent degree. It took billions of years of incubation to evolve the cellular life on Mars, then billions of years more incubation on earth to evolve complex cellular systems such as us. A single planet does not have the life span to evolve complex cellular systems on its own thus we are much more rare than previously thought.

  • Unless life on earth functions as some sort of substrate within an informational hierarchy that is inaccessible (like a sim for instance, very interesting but somewhat moot as well) life on earth likely began …. no one knows since we haven’t been able to produce life from non-life as yet, or even proto-life. Still, the quest to answer this question via lab experiments has led to other useful discoveries, as so often happens in science. Will lab abiogenesis be like fusion- always a few years away? Idk, maybe not. I imagine if CERN big-science level proposals were realized whereby platforms that enable millions of automated and precise experiments to occur, then perhaps it would be one of those huge question things science could finally nail down. Panspermia while interesting and even if evidenced just offloads the question.

  • Now I REALLY wanna shoot some endoliths into space! You know, just in case we are alone or just very rare… let's give life a chance to develop elsewhere. Then maybe life can continue on somewhere else after life on earth is long gone. It would be sad if nobody can experience this wonderful place.

  • Rock sex.

  • Can we leave the localgroop .whot space craft wude we you’s.

  • Yes it had to.. just like everything else did.

  • What is this fetish to attribute life, water, etc., as having come from somewhere else instead of having just been here or formed here to begin with?

  • Haven't yet seen anyone tie these things to the panspermia hypothesis. Is it possible these two examples of 'strange life' could have come in on meteors or comets? And, are these the life forms that life on earth evolved from over the last few billions of years? They could have come in on impact shards from Venus, Mercury, Mars, or any of the stony planets or moons in our own solar system, or from distant solar systems or galaxies. That they live on such little energy input and 'food' makes them ideal inter-system or inter-stellar space voyagers. Both of them could last millions of years in a form of suspended animation until land impact, or in the case of the aquatic variety, frozen in icy comets… I think their energy needs fit the scenario of panspermia perfectly. Just a couple of thoughts for consideration!

    See time at 7:55 for the amazing low energy requirements that might support 'panspermia' as icy or stony meteors travel through the voids of space.

    https://www.bing.com/videos/search?q=microbes+living+deep+in+the+ocean+Ted&view=detail&mid=8BCB94E8900972A1096A8BCB94E8900972A1096A&FORM=VIRE

    https://www.bing.com/search?q=microbes+living+deep+in+the+earth&form=EDGNB2&mkt=en-us&httpsmsn=1&plvar=0&refig=4a3efc0cec8b42b7b662c73fe371c37d&sp=-1&pq=microbes+living+deep+in+the+earth&sc=0-33&qs=n&sk=&cvid=4a3efc0cec8b42b7b662c73fe371c37d

    https://www.bing.com/search?q=microbes+living+deep+in+the+earth&form=EDGNB2&mkt=en-us&httpsmsn=1&plvar=0&refig=4a3efc0cec8b42b7b662c73fe371c37d&sp=-1&pq=microbes+living+deep+in+the+earth&sc=0-33&qs=n&sk=&cvid=4a3efc0cec8b42b7b662c73fe371c37d

    https://www.bing.com/search?q=microbes+living+deep+in+the+earth&form=EDGNB2&mkt=en-us&httpsmsn=1&plvar=0&refig=4a3efc0cec8b42b7b662c73fe371c37d&sp=-1&pq=microbes+living+deep+in+the+earth&sc=0-33&qs=n&sk=&cvid=4a3efc0cec8b42b7b662c73fe371c37d

    https://news.nationalgeographic.com/2017/04/deepest-life-earth-mariana-trench-astrobiology-science/

    See time at 7:55 for the amazing low energy requirements that might support 'panspermia' as meteors travel through the voids of space.
    https://www.bing.com/videos/search?q=microbes+living+deep+in+the+ocean+Ted&view=detail&mid=8BCB94E8900972A1096A8BCB94E8900972A1096A&FORM=VIRE

    CHEERS!1

  • …Giorgio

  • Life on Earth started in the sub atomic dimension.

  • Why not build a bomb, that is surrounded by trillions of tiny smart probes and when the bomb explodes it sends those smart probes at a significant speed of light in every direction in our galaxy

  • I believe the origin of life is a biochemical process that occurs everywhere in the universe where conditions are favorable.

  • It's neat that Chrono Trigger and Final Fantasy VII took note of cryptobiosis and used it as inspiration for Lavos and Jenova respectively.

  • Of course panspermia doesn't "explain how life first arose". That's not the point. The point is to attempt to weigh which is more likely: multiple unrelated instances of life developing in the galaxy, or a single instance of life followed by multiple panspermic events. That is to say, whether it's harder for life to arise in the first place (therefore panspermia can explain the widespread presence of living organisms in space) or if it's harder for life to escape its native celestial body (in which case independent abiogenesis events greatly outnumber panspermic events).

  • So.. We are not “Earthlings”!

  • Panspermia from Mars, I heard Mars use to have a magnetic field and liquid water.

  • Life came from God, Jesus Christ appeared to me

  • What if the aliens just sent small spaceships containing lifeforms from their planet and one landed on earth. We then unknowingly evolved from that and in the future will be sending our own spaceships contaminating other planets and repeating the cycle

  • 81 beats per minute ask who dory is every race will sleack at once

  • He's a cool guy I like him you see every one likes him

  • I'm so proud I got dory the job what a guy I like dory

  • Spinning a light spun orb and swapping left and right side so it spins for ever will make crush smaller proportionate spinning in equal and opaite will give boyancey binary is the onley thing that needs to be invented for easy split second swaps firing a red lazzer beam to find silver in sixty degrees folding where orange occurs hmmmm no no just when silver its 9 minutes into fireing the lazzer other colour is purple

  • Ur videos ate shit just put dory on to say sorry

  • as a non natıve speaker of englısh ı found thıs vıdeo and topıc hard to understand. but even ıf ıt ıs, It worths 🙂

  • This channel is awesome! SO glad to have found it. Thank you so much for making all these informative and interesting videos!

  • Lol when planets like earth eject rocks containing microbes into space due to collisions with other objects it's basically a planetary ejaculation

  • When are we going to get past pre-1905 thinking ? Just because life appeared in the past does not mean that's when it originated. Now that it has been mathematically shown the topology needed for a black hole to act as a pathway to the "past", we have to consider the intelligence behind intelligent design may turn out to be that of our descendants.

  • LIfe came from blue ice by a passing spaceship – Aliens call earth the poo planet.

  • 1:23 Misspelled 'biosphere'

  • The topic that life came from outer space or started on our planet should almost be irrelevant. We should still be asking how life started. Weather it started here or somewhere else shouldnt really matter as how life started at all is the big question we should still be asking. Doesnt really make a difference where life on earth started as if we come to the conclusion that it did come from an asteroid or from panspermia still leaves the question of how it started at all. We know pretty much what it takes for life to start for the most part but lack a few ingredients or conditions to replicate it our selves. When we figure that out then where it begun will maybe be more important then. Also we have no clue on how many different ways life can evolve, form or even what different kinds of Life are made up of as we have speculated and have many different opinions but we sure don't really know. Once we get out there and actually see what's around the actual universe we may find that there are all kinds of different ways life has formed and all different matters of chemical makeup. either way in my opinion our main question should still be how life formed first, once we figured that out then where it formed will actually be much easier to determined and then maybe be a little more important..

  • Several hundred kelvin you say 🤔 so a pleasing 26,87 celcius 🤔🤔

  • I agree Space came from Life on Earth

  • Earth and Space but still not proven if that started our beginnings..

  • Everything here on the planet came from space and 4D.

  • I like this

  • 4:58 souls going to heaven

  • Fact: NASA spends 190,000 $ on fuel to account for the weight of spores-and bacteria on the body of the rockets.

  • So what about us causing "pamspirmia" by launching a vehicle toward a likely habitable planet?

  • This would mean that there could be life with a common ancestor as humans on another planet

  • I am thinking anyplace life CAN exist, it WILL exist – Earth itself being my test case as proof. Energy+Water+Minerals = Life.
    It's just how this instance of Universe exists.

  • The seeds of life are spread across all Spacetime, but your soul came from Yahweh.

  • Hey, I had to re subscribe, just thought I’d let your team know I was auto unsubscribed.
    Life your show, wondered why I wasn’t being notified.

  • I feel the narrator may be an E.T, those gestures 🤔😂

  • If DNA or RNA life is found elsewhere in our solar system then it may well be more universal than unique

  • Humanity are not bacteria…

  • Radiopanspermia also wouldn't work because anything light enough to get blown out by the solar wind and/or radiation pressure of the source star won't be able to make it in through the solar wind and/or radiation pressure of the destination star.

  • Haven’t some microbes been found on used nuclear fuel rods?

  • If abiogenesis only happens once every one decillion years, then panspermia would be necessary for the universe to get life in it.

  • German title but not a german subtitle translation. Thats really bad PBS!…you can do it better 🙁

  • What about the dark night probe

  • I think that believing life came from somewhere else is as lazy as thinking God created life plain and simple. Life coming from other planet doesn't mean anything and it explains nothing, only pushes the problem away.

  • Isn't there like a big deal to build artificial satellites in clean room conditions so that we don't send germs in space (mostly because it complicates the search for extraterrestrial life, since any germs we find could be from us)? I'm surprised and hear this the first time, that microbes were purposefully shot into space.

  • 15:45

    Damn, I love me some free content, but you’ve got a REALLY good point here. Maybe we SHOULDN’T insist on everything being free…

    Either way, I love this channel, I’m very glad I stumbled across it. I’ve been binging these videos for days now! One thing I really like, is in one of the videos (I’ve actually seen 2 so far) you corrected something in a previous video that was less-than-correct after being presented with evidence to the contrary. That takes a massive amount of integrity. Stuff like that earns my subscription. Thanks for such great content!

  • Thanks! Question: how likely is it that life could be floating through the galaxy, and just happen to hit Earth at the earliest possible time for it to take hold – yet, we don't see any evidence of it in the comets & asteroids that hit us now? If panspermia is true, then why wouldn't we still see that life floating around all over the place? This seems at least as unlikely as Earthly abiogenesis. tavi.

  • There is more evidence civilization arrived not a product of evolution…

  • Why else would human bioclocks not perfectly synchronized with the ≈24 hour Earth Day?

  • I honestly think we originated from another planet not earth but a entirely different planet light years away

  • Sorry but God of abraham says it did start on earth.

  • 7:04 MULTICELLULAR TITTY BEAR

  • Life may—may have come from Mars, Venus, Theia etc. but I simply cannot fathom that it arrived from an interstellar location. As rare as life is, (due to the raretiy of habital real estate, and not because it isn't robust enough) speaking as a Marine sniper it's pretty hard to hit a target over a mile away, yet alone interstellarly?? Ejected material even with all the assistance it can possibly receive, now is at such impossibly greater odds of happening than compared to just formation/creation here from scratch.

  • 1:26 biosphere is spelled incorrectly!

  • Sorry I just read the title and had to comment. Obviously yes, earth is a planet and as such a byproduct of space.

  • 420k views

  • So, what you're saying is that we have stars out there masturbating and shooting their panspermia all of the universe? Sounds icky bro!

  • Tardigrades can also survive radiation bombardment by excretion of protective proteins. We should send quadrillions of these to Mars

  • When we go to Mars, we need to take a fuck tone of these with us.

  • God he's boring…

  • I hate the idea of panspermia. It’s just based on a very anti earth bias. The only evidence we have for this is that it can happen not that it’s ever happened to us. That’s not enough evidence for me. It’s a silly idea that puts you back at the same question of where did life come from

  • Before watching, yes. It did. There is an entire medium of organic particles out there.

  • About the entry temperature, maybe the early earth atmosphere was thinner, so there was not so much temperature during entry ?

  • Really don't like this argument. It's just passing the back. If life could have originated elsewhere and then come here, why not just presume life here originated here?

  • Technically earth is a part of space and the universe so technically there’s no way it could’ve come from anywhere else

  • That hot face is where the bulk of the views come from

  • Here's another theory for you. With the discovery of the bacteria on the outside surface of the International Space Station and levitating bacteria there exists a real possibility that we are already sending life forms to other planets. If these levitating bacteria hitchhike on the solar winds, they may be able to travel all over the solar system and possibly beyond.

  • The problem with Panspermia, no matter how plausible, is that it doesn't solve the issue, it only displaces it: life has to appear somewhere. Epistemologically speaking, abiogenesis is so much more economic in the number of "What if" that Panspermia becomes absurd… Since even with Panspermia some form of abiogenesis must occur before.
    Still a very cool topic though, and I wonder if biology may not be a good hint at how feasible Panspermia is anyway: remember, all those microbes we've tested are modern, evolved ones. There is absolutely no guarantee that simpler, less evolved lifeforms from our past could survive those insane conditions. Which is concerning, since Panspermia suggests all lifeforms on Earth come from a common ancestor that was able to make it. It really seems way too much of a stretch, especially when we weigh in the Fermi Paradox.

  • nosuch thing as excix or nerx or not, likex science s ok, not nerx

  • I can cum quite far.

  • So someone… something fucked Earth? Wow… that explains a lot!

  • Maybe life started with the aliens in area 51

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