Choose the statement that best describes how a moon can be destroyed within the Roche limit.

Which planet is the most heavily cratered?

Which world did Spirit and Opportunity explore?

What is the disk-shaped belt of icy bodies believed to extend from about 30 AU to 50 AU from the sun?

Shapley determined that the Sun was at the center of the galaxy.

How do astronomers explain the fact that all galaxies outside our Local Group show a redshift?  The universe is

The Hubble constant is about 70 km/s/Mpc70 km/s/Mpc, which means that a galaxy traveling at 2800 km/s away from the Milky Way is about 40 Mpc away.  What would the velocity of the Milky Way be as seen from such a galaxy?

Match the types of galaxies to the pictures.

Which part of our galaxy is the youngest?

Match the populations of stars to their descriptions.