What if we discovered life on Venus?

ThePoarter

Banned Forever
Banned
Suspended
Location
Melbourne
Let's s instead of Mars on a trip to Venus to pick up soil samples or anything similar in the atmosphere we learn that Venus has life. Single cellular organisms. It's all we find on the planet in following checks and visits. Imagine if it was discovered today or in the near future.

How would this change everything?
 
Well, it would be scientifically interesting. It would be evidence that life is common in the universe, though Earth and Venus are close enough that panspermia is relatively plausible (if Venusian life is weird life independent origin is more likely). Other that that, I don't think much would change.

I assume this life lives in the high atmosphere of Venus. If it lives on the surface it would probably have to be very weird life.
 
Well, it would be scientifically interesting. It would be evidence that life is common in the universe, though Earth and Venus are close enough that panspermia is relatively plausible (if Venusian life is weird life independent origin is more likely). Other that that, I don't think much would change.

I assume this life lives in the high atmosphere of Venus. If it lives on the surface it would probably have to be very weird life.
If it is surface life, that would also indicate even more strongly that life is common, and that we may be looking in the wrong places for it. If life can survive there then there's a much broader range of possible environments for life than we thought.
 
The deep crust is a possibility.

It could have survived and evolved from the time when Venus was more earthlike.

Article:
Life in deep Earth totals 15 to 23 billion tons of carbon—hundreds of times more than humans

Barely living "zombie" bacteria and other forms of life constitute an immense amount of carbon deep within Earth's subsurface—245 to 385 times greater than the carbon mass of all humans on the surface, according to scientists nearing the end of a 10-year international collaboration to reveal Earth's innermost secrets.

On the eve of the American Geophysical Union's annual meeting, scientists with the Deep Carbon Observatory today reported several transformational discoveries, including how much and what kinds of life exist in the deep subsurface under the greatest extremes of pressure, temperature, and low nutrient availability.

Drilling 2.5 kilometers into the seafloor, and sampling microbes from continental mines and boreholes more than 5 km deep, scientists have used the results to construct models of the ecosystem deep within the planet.

With insights from now hundreds of sites under the continents and seas, they have approximated the size of the deep biosphere—2 to 2.3 billion cubic km (almost twice the volume of all oceans) - as well as the carbon mass of deep life: 15 to 23 billion tonnes (an average of at least 7.5 tonnes of carbon per cu km subsurface).

The work also helps determine types of extraterrestrial environments that could support life.

Among many key discoveries and insights:

[cont. reading]


Temperature and pressure upper boundaries are unclear:

  • The absolute limits of life on Earth in terms of temperature, pressure, and energy availability have yet to be found. The records continually get broken. A frontrunner for Earth's hottest organism in the natural world is Geogemma barossii, a single-celled organism thriving in hydrothermal vents on the seafloor. Its cells, tiny microscopic spheres, grow and replicate at 121 degrees Celsius (21 degrees hotter than the boiling point of water). Microbial life can survive up to 122°C, the record achieved in a lab culture (by comparison, the record-holding hottest place on Earth's surface, in an uninhabited Iranian desert, is about 71°C—the temperature of well-done steak)
  • The record depth at which life has been found in the continental subsurface is approximately 5 km; the record in marine waters is 10.5 km from the ocean surface, a depth of extreme pressure; at 4000 meters depth, for example, the pressure is approximately 400 times greater than at sea level

I could imagining life having adapted to supercritical water, using its different properties for exotic biochemistry.
 
Are we talking something biochemically equivalent to terrestrial life, adapted for extremophile niches or something weird to which Venus' horrible surface environment is comfy?

Or to put it another way, what's history going to look like if Venera 13 sends back a picture of a hungry-looking Oucher-Poucher, then stops transmitting?
 
Are we talking something biochemically equivalent to terrestrial life, adapted for extremophile niches or something weird to which Venus' horrible surface environment is comfy?

Or to put it another way, what's history going to look like if Venera 13 sends back a picture of a hungry-looking Oucher-Poucher, then stops transmitting?


Exactly. Thoughts and reactions? Assume it was discovered when it first landed, or now or in the near future.
 
There would be a massive drive to get more probes, and eventually people, to Venus. Lots of terraforming ideas would be fielded, to be sure.
 
There would be a massive drive to get more probes, and eventually people, to Venus. Lots of terraforming ideas would be fielded, to be sure.
I would think discovering multicellular life would squelch any serious motivation towards terraforming. It would produce a lot of ethical concerns about sending more probes, let alone bacteria filled humans.
 
The deep crust is a possibility.

It could have survived and evolved from the time when Venus was more earthlike.
Wouldn't Venus's interior be at least as hot as its surface? If the deep crust was cooler than the atmosphere, heat generated by radioactive decay in the interior couldn't escape - and it would have built up until a more-or-less one-directional temperature gradient from the interior to the atmosphere was established. Yeah, on Earth it's often cooler at a shallow depth under the ground than on the surface, but the rocks a few kilometers below the surface are hot. A cool Venusian deep crust might have survived for a while after the surface became the way it is now, but I doubt it would last for billions of years - especially given that Venus might have had at least one more-or-less total resurfacing event within the last billion years. I guess water might stay liquid under high temperatures and extreme pressures, but would conventional biological chemistry even be possible at 500 C?
 
Overall it seems plausible that Venus could have microbial life as we know it living either in its upper atmosphere or underground, just not on the surface. In either case it has the advantage that Venus, like Mars, was once much more habitable, meaning that life could've evolved then, with isolated extremophiles surviving the eventual collapse. This also means that Venus and Mars are probably the best candidates for multicellular life as we know it off of Earth, just not with the expectation of it still being alive.
 
Everyone except the wonks concerned with the great filter is excited, even bacteria could cause public excitement on par with the Apollo Landings.
 
Well, as a Xian, specifically High Church Anglican, I would welcome the announcement of life elsewhere. I have no doubt about it now, and it shows that God is not some limited Calvinist.
 
Everyone except the wonks concerned with the great filter is excited, even bacteria could cause public excitement on par with the Apollo Landings.
That would be the case if it was all at once. But in practice first we're going to get some suspicious satellite pictures or soil samples, then they're going to send a follow-up probe, with the evidence mounting, and even when scientists are comfortable declaring it to be real there will still be naysayers in and out of the scientific community that its just a dirt clod or pre-life biological soup or something.
 
I would think discovering multicellular life would squelch any serious motivation towards terraforming. It would produce a lot of ethical concerns about sending more probes, let alone bacteria filled humans.
I didn't say that it would happen, or be seriously entertained by the various space programs. But various theorists would put forth alot, regardless.
 
Exactly. Thoughts and reactions? Assume it was discovered when it first landed, or now or in the near future.
Not answering my question. Are the venusians:

• Extremophile microorganisms biochemically equivalent to terrestrial life.
• An entire multicellular biosphere of terrestrial complexity composed of inorganic starfish aliens.
 

Those have totally different ramifications. If it's an extremophile organic biosphere, then that means they must have survived from a very long time ago, and its possible that Earth and Venus were both seeded by the same panspermia event in which case life might still be vanishingly rare. If it's a thriving exotic biosphere, then that means life is probably everywhere, and the chances of intelligent life in our immediate cosmic neighborhood rise dramatically.
 
Those have totally different ramifications. If it's an extremophile organic biosphere, then that means they must have survived from a very long time ago, and its possible that Earth and Venus were both seeded by the same panspermia event in which case life might still be vanishingly rare. If it's a thriving exotic biosphere, then that means life is probably everywhere, and the chances of intelligent life in our immediate cosmic neighborhood rise dramatically.
And if it's literally both, as in, a thriving exotic biosphere and organic extremophiles, life is presumably even more common.
 
Back
Top