How do we know that quasars are very distant objects?

What kind of pressure prevents a white dwarf from collapsing?

Kepler’s third law states: p2 is proportional to a3

Which of the following is an example in which you are traveling at constant speed, but not at constant velocity? (Velocity has both magnitude and direction).

Why would we expect WIMPs to be distributed throughout a galaxy’s halo, rather than settled into a galaxy’s disk?

Picture1.jpgThe diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar’s surface temperature and luminosity during Stage 1, when gravity assembles the protostar from a collapsing cloud?

An astronaut in space swings a ball attached to a string in a circular motion. If the string suddenly breaks, how will the ball move?

What is the definition of astronomy I gave you at the start of the course?

Kepler’s Third Law relates what quantities?

When we speak of the entire universe (as opposed to the observable universe), we mean