Life on Mars
jcherwon at dres.dnd.ca
Fri Aug 9 09:31:53 EST 1996
Thanks for the note about the September 16 issue of Science having a note
on the micro-fossils from Mars. I'll be looking forward to reading this.
I wonder if it'll state how they know it's from Mars and how they know
the rock is about 4 billion years old but was blasted about 15 million years
ago. Could it have been a piece blasted from the earth that returned after a
long orbit (aren't tektites formed like this?), could it even be from outside
the solar system? I recall that one of the theories about how life started on
earth was that it may have been seeded by material drifting from outside the
Other thoughts are that:
- Carl Sagan once did an assessment that given life began very shortly after
conditions were suitable (i.e. there is almost no lag time) it is a very
- articles in Discovery magazine show that Mars could have had conditions
suitable for life a long time ago. Unfortunately, without a strong magnetic
field, the solar wind chipped away at the atmosphere until it is 1%, instead
of the 10% it should be, that of the earth.
So I'm wondering:
- could life have started first on Mars and then seeded earth following a
- could earth have seeded Mars (and possibly other planets and moons), with
life following a meteorite blast that struck our planet?
Take care ...John
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