Mars is smaller and cooled down before Earth. That means it had liquid water while the Earth was still too hot. Therefore, it's possible that life first appeared on Mars, and was later transferred to Earth on a meteorite.
Interesting. How would a meteorite pick something up in one planet to carry it to another planet? I'm presuming that the hypothetical meteorite does not originate in Mars.
bbojan|3 years ago
dmos62|3 years ago
ihatepython|3 years ago