Suppose we discover a super-Earth at a distance of 10AU from its ...

[Tazate]

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.

[stillxalice]

Answer to Question 1

A

Answer to Question 2

B

[Tazate]

TY

[stillxalice]

You're welcome