AST CH1 Questions
2. For one thing, we can actually see other planets and
moons that could be habitable, whereas in the past we could not even see them.
Secondly, we have a better understanding of life, and what conditions must be in
place to harvest life. Because we know conditions for life and we can observe
more and more planets with these potential conditions, we can actually
reasonably say life outside of Earth is possible.
7.
1.
Mars because we can observe evidence of dried up
water canals that could have harvested life in the past. Also there are significant
amounts of water ice currently.
2.
Europa because it has deep oceans of liquid
water under icy crust.
3.
Ganymede and Callisto because they show evidence
of subsurface oceans.
4.
Titan because it has a thick atmosphere and
lakes of liquid methane.
12. C
17. C
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