It is found that asteroids carry traces of Martian soil and its environment. One theory suggest that these were ejected into open space due to Mars collision with Asteroids. Some of these meteorites may have landed on entered into earth orbit at some point or may still happen. This theory came into existence because these meteorites are found well before the Mars mission were planned.

This one totally got me thinking, Because when I watched super girl the series I heard a lot about Martians and life existence in Mars and a whole lot of stuff about Extra terrestrial attacking Earth expecially in Superman the Smallville and thanks for taking my mind back and this was really educative