Exam 15: Galaxies and the Foundation of Modern Cosmology

According to the theory that active galactic nuclei are powered by supermassive black holes, the high luminosity of an active galactic nucleus primarily consists of ________.

How is the energy that powers radio galaxies, quasars, and other active galactic nuclei produced?

In a uniformly expanding universe, which statement best describes the situation as viewed from an observer in Galaxy C (not the Milky Way Galaxy)?

A lenticular galaxy is another name for an elongated elliptical galaxy.

How many more stars does a starburst galaxy form, in one year, than the Milky Way?

Based on current estimates of the value of Hubble's constant, how old is the universe?

Although the entire universe may be much larger than our observable universe, we can see only within our observable universe. The "boundary" of our observable universe is called ________.

List at least three qualities that make an astronomical object a good standard candle.

Give several observations supporting the idea that the high redshifts of quasars really do imply great distances.

Which of the following is not true of quasars?

Why should galaxy collisions have been more common in the past than they are today?

What is a central dominant galaxy?