To: gondramB
"So how does the rock leave Mars? Does it leap off the planet?"
Meteors hit Mars. The impact scatters rock from the surface of Mars up and out. Some reach Martian escape velocity and go into solar orbit. Of these, some become meteorites and reach the surface of Earth. The composition of Mars and the Earth are dissimilar enough that we know that this has happened. One meterorite in 1984 reached Antarctica; it had the possibility that microbial life existed on Mars.
Several scientists believe that life in the universe is common -- if it's microbial, similar to domains Archaea and Bacteria here. What is rare would be complex life such as lichen and rotifers, let alone humans.
13 posted on
04/04/2006 6:27:43 AM PDT by
GAB-1955
(being dragged, kicking and screaming, into the Kingdom of Heaven....)
To: GAB-1955; SengirV
16 posted on
04/04/2006 6:30:47 AM PDT by
gondramB
(Render unto Caesar that which is Caesar's and unto God that which is God's.)
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