Quiz 7

Question 1

Cepheid Variable Stars are used to:

Answer 1

Measure great distances in space.

Question 2

The rotation curve of a galaxy shows that if you look at the speed of stars and gas that orbit the galaxy that their speed does not decrease as would be expected by Kepler’s second law. This leads to one of the fundamental problems of modern astronomy and currently is best explained by:

Answer 2

The existence of dark matter.

Question 3

The nucleus of our galaxy is now thought to be an energetic environment because of the presence of:

Answer 3

A supermassive black hole.

Question 4

The relationship between the distance a galaxy is from Earth and the speed it appears to be moving away from us is called:

Answer 4

Hubble’s Law

Question 5

In 1963 Caltech astronomer Marten Schmidt observed that quasar 3C273 was moving at 15.8 percent of the speed of light away from us and thus concluded it could not be an object in our galaxy since it would have left the galaxy a long time ago at that speed. What feature of the quasar to did he measure to obtain that value?

Answer 5

The quasar’s red shift.

Question 6

The bending of light due to the great mass of distant galaxies is called:

Answer 6

Gravitational lensing.

Question 7

What are two examples of Active Galactic Nuclei?

Answer 7

• Seyfert Galaxy

- Quasar Galaxy

Question 8

Quasars were first discovered by observations at what wavelength?

Answer 8

Radio

Question 9

The primary mechanism by which galaxies evolve is:

Answer 9

Galaxy mergers.

Question 10

The primary evidence for the expanding universe is:

Answer 10

The red shift of almost all galaxies.