The Moon is considered to be constantly “falling” toward Earth.

Briefly explain why icy moons can have active geology at much smaller sizes than rocky worlds.

According to Kepler’s third law: 

The ______________________    ____________   ______________ (three words) is the spectrum in which we see lines of specific colors against a black background. 

Earth is closer to the Sun in January than in July. Therefore, in accord with Kepler’s second law: 

Two stars that are in the same constellation: 

The ___________    ____________(two words) is the theory that the universe began from one point and has been expanding ever since.

Which lists the jovian planets in order of increasing distance from the Sun? 

Choose only one answer

The question mark is the shift of the