system
Given the following post, respond as if you're commenting on Reddit:
human
Given that asteroids from Mars are found of Earth, would asteroids from Earth be found on Mars?

And, if we find life on Mars, how would we show it wasn't just seeded there from Earth from one of these asteroids? 

I know that we have found chunks of Mars on Earth in the form of some very rare asteroids. The thought being that pieces of Mars could be thrown into space during large asteroid collisions. Could this happen in reverse?...maybe with some large impact like the Yucatán impact of 65-million years ago?
gpt
Sure, but it's much much more unlikely. Earth's gravity is a lot stronger than mars, 9.8 m/s² compared to 3.7m/s², so that already makes it harder for chunks of earth to leave and go flying around aimlessly. Earth also has a much thicker atmosphere, so most meteors won't be enough to leave a crater on earth, nevermind send material flying at terminal velocity, so only really catastrophical impacts could have a chance at shooting anything into mars. Mars' smaller gravity also makes it harder for it to "catch" a meteor that is sent in its general direction, it'd be likelier to just whizz by. But nothing stops it from happening.