[Carl Vehse]

"It sucks that mars is so far away."

Mars is probably "so far away" for a reason. If it were significantly closer, gravitational interactions with Earth and the other inner planets could result in a chaotic orbit that would result in an eventual collision with the Earth, ruining a lot of people's weekends.

Also, Mars' inner moon, Phobos, is inside its Roche limits, so that it eventually will be torn apart and crash into Mars (sometime in the next 100 million years). The collision would result in a large amount of debris ejected into space, some of which will collide with Earth. If closer to Mars, Earth would just catch more Martian flak, again ruining a lot of weekend plans.

[UCANSEE2]

Mars is probably "so far away" for a reason. If it were significantly closer, gravitational interactions with Earth and the other inner planets could result in a chaotic orbit that would result in an eventual collision with the Earth, ruining a lot of people's weekends.

IIRC, the best guess is that this already happened.

[dfwgator]

The collision would result in a large amount of debris ejected into space, some of which will collide with Earth.

You say that as if that would be a bad thing.