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.
The Sun as it appears from the surface of Earth during the middle of the day
Earth’s Major Tectonic Plates
Ocean cover most of Earth’s surface
Views of Earth’s Layered Structure
Earth’s Climate System
A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ...