Quiz 6

Question 1

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

Answer 1

Gravitational lensing.

Question 2

What are two examples of Active Galactic Nuclei?

Answer 2

• Quasar Galaxy.

- Seyfert Galaxy.

Question 3

Quasars were first discovered by observations at what wavelength?

Answer 3

Radio.

Question 4

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 4

The quasar’s red shift.

Question 5

Olber’s paradox starts with the assumption the universe is infinite in extend and age and then concludes that:

Answer 5

The sky at night should not be dark.

Question 6

The primary evidence for the expanding universe is:

Answer 6

The red shift of almost all the galaxies.

Question 7

If the universe is expanding now then things must have been closer to each other in the past. If we imagine running time backwards then the galaxies would be moving towards each other instead of away. If we allowed time to continue to run backwards then eventually all the galaxies will be together. That event where all the material in the universe was together is called:

Answer 7

The Big Bang.

Question 8

The age of the universe is thought to be approximately:

Answer 8

13.7 billion years.

Question 9

What are the three possible shapes for the geometry of the universe?

Answer 9

• Flat.
• Open.
• Closed.