The Great Red Spot of Jupiter is _______.

How are regular satellites thought to have formed and evolved?

Does the Moon have volcanism today? How do you know?

Why are the lunar maria so smooth and flat?

If Saturn had no moons would it still have rings?

What do the vesicular basalts tell you about the evolution of the lunar surface? 

What is one of the two types of planets in the solar system?

Why are electrons in an atom only able to occupy certain permitted orbits? 

What is outgassing?

Geophysicists can estimate the distance to an earthquake if they can measure which of the following?