Suppose we discover a super-Earth at a distance of 10AU from its star. Should we consider it to be potentially habitable?
A) Yes, its atmosphere may contain substantial amounts of greenhouse-type gases that can keep the planet warm beyond the usual boundaries assumed for habitable zones.
B) Yes, because its host star must be much bigger in order to have a super-Earth, so it will be much hotter there.
C) No, only planets at approximately 1AU will ever be potentially habitable.
D) No, greenhouse gases freeze-out at those distances.
Question 2
Collisions between galaxies is thought to
A) have stopped about 5 billion years ago.
B) be commonplace.
C) have never occurred.
D) be extremely rare.
E) have only occurred between 10 and 15 billion years ago.
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