Transferal of life

DeepSpace9

Couple questions..

Is it true there are dried up river, deltas etc.. on Mars?

Therefor there must of been water, IF there were single celled organisms that sprouted to life during this time, it is a FACT that they would be transferred to Earth during the Heavy Bombardment. Correct?

This could very well be how life started off, since a lot of people think life came from amino acids from asteroids in the first place...

Mars life (if true) would pre date Earth life, because around the time of the rivers on Mars, Earth was still in a cooling phase after the Mars size rock hit Earth, causing the Moon..

Ryan_m_b

There are outflow channels on Mars but I'm not sure if it's definitive if they are caused by water.
No. Just because there is water doesn't mean life arose. Even if life was there it's not a certainty it would be jettisoned off in a meteor. Even if it was jettisoned off there's no certaintly it would survive. And even if all that were true there's no certaintly that particular meteor would hit Earth.
Who? The Miller-Urey revealed long ago that amino acids could have arisen on a primordial Earth.
What sources do you have to support this?

d3mm

It appears "Mars == Nearest Neigbour" is no longer the domain of popular science. Look at the caption for the diagram at http://cars9.uchicago.edu/gsecars/LV...%27%20core.htm

I said in another thread that I am not surprised science journalists can't get it right when the source is ambiguous.

DeepSpace9

Well i more than likely it would be water..

If these single cell organisms can survive all the ice ages, extreme heat and the meteor impacts that hit Earth, why wouldn't life be able to survive deep inside the cracks of the asteroid going through space?


You must not be too familiar with the early life of our solar system.. Before there were the 8 planets, there were quite more planets. Over time they all collided making the planets with stable orbits we have today.

Is the has the Moon been orbiting Earth ever since the Earth formed 4.5 billion years ago?

Ryan_m_b

The time to accept that it is is when the burden of proof has been met, not before.
Species survive because they were able to avoid these things you speak of. A single celled organism that would be utterly denatured at 50-100C would not survive a meteor impact. That's not to say it wouldn't be impossible for an extremophile to be ejected from some adjacent land but it is by no means a certainty.
I'm familiar with this, what is your point? How does this relate to me asking you for sources to back up your claim that Mars would have evolved life before Earth? Given that the event that caused the Martian global dichotomy is dated at around 4gya it seems unlikely.
No but that is irrelevant to everything that I have said.

DeepSpace9

So the point about the Moon I was making was as following; Earth never had life before the Moon. Therefor life would not spring into existence on Earth until.. 500 million years after the Moon was formed. Now Mars didn't go through this phase, therefor their life would have a head start on Earths life.

And sure life could very easily survive an asteroid impact, after all the dinosaurs did. They died off due to lack of sunlight etc. So why couldn't basic germs deep inside the rocks that have escaped the gravity of Mars survive? The rocks that were projectiles were not magma or melted rock, they were still solid, therefor life could very easily survived through the vacuum of space and the trip to Earth.

Lets say during heavy bombardment, this scenario happened, life was than brought to Earth from Mars rock and sprouted life on Earth.. If scientists find cells in Mars rocks that are the same as here on Earth, is this enough proof to say that life came from Mars?

Ryan_m_b

Three things:
1 - What about the formation of the Martian Global Dichotomy that happened at a similar time as the Moon's formation?
2 - Where does this half a billion year figure come from? Citation please or admit that you made it up or the thread will be locked.
3 - Life is not a teleological process. It's a drunkards walk through a fitness landscape determined by environmental conditions acting on random mutations. Taking one population and splitting it into multiple identical, separated samples will result in wildly different results after time.
If you realise how silly this statement is why say it?
I didn't say they couldn't I said it wasn't a guarantee that it would happen.
No, if we found cells on Mars that matched Earth as it is now it would be an indicator that they got there very recently.

The type of life that existed 3.5-4 billion years ago was so utterly different to anything we have now that I doubt there would be any way to conclusively say it was related to terrestrial life (ignoring the fact that life that ancient is not well preserved enough for that kind of study). Relating to what I said before if life had been evolving on Mars for hundreds of millions or billions of years after it spread to Earth it would be so different from us that it is highly unlikely there would be any similarity beyond the basic biochemicals used. And without a theory of abiogenesis and an understanding of primordial Mars we couldn't say if it was more likely if they transferred or both favoured the evolution of that kind of life.

DeepSpace9

I did not say it has been evolving on Mars after it spread to Earth, I said it was evolving than asteroid impact causes some life to come to Mars, and all life is wiped out on Mars during this event... This is very plausible, I didn't make up figures, this is a rough estimate according to the heavy bombardment phase and http://en.wikipedia.org/wiki/Formati...e_Solar_System

russ_watters

This is all just idle speculation. Thread locked.