It may seem surprising to people, but you can look at something like Mars, which has a very thin atmosphere, and you can look at something like Venus which we tend to think of as sort of having this rather heavy, clouded atmosphere, which [is] hellishly warm because of runaway greenhouse effect, and
on both of those
planets you are seeing this phenomenon of the atmosphere leaking away, is actually what directly has led to those very
different outcomes for those
planets; the specifics of what happened as the atmosphere
started to go in each case [made] all the difference.
You
start out in the lush green hills of Dream Land, but as you go
on, you venture into space and platform
on different planets and other intergalactic objects.