Astronomy Final Exam: Chapters 18 & 19

Question 1

What is Olber’s paradox?

Answer 1

The Universe is not old enough to fill the sky w/ light

Question 2

What is the cosmological principle?

Answer 2

An observer’s view of the Universe depends neither on the direction in which he looks nor his location

Question 3

What is the Copernican principle?

Answer 3

Earth is not the center of the Universe (observers do not occupy a special place)

Question 4

What is the Universe’s composition?

Answer 4

-68% dark energy
-27% dark matter
-less than 5% normal matter

Question 5

Does dark matter interact with electromagnetic force?

Answer 5

No

Question 6

What is dark energy associated with?

Answer 6

Increasing expansion of the Universe

Question 7

What are the Four Forces?

Answer 7

Gravity, electromagnetism, weak, and strong

Question 8

What is recombination?

Answer 8

Photons emitted at epoch

Question 9

What is the cosmic microwave background temperature?

Answer 9

2.726 K

Question 10

What is the Habitable Zone?

Answer 10

The distance from a star which liquid water could exist on orbiting planet’s surface

Question 11

What is the Habitable Zone for small, cooler stars?

Answer 11

Zone closer to star (Sun)

Question 12

What is the Habitable Zone for massive, hot stars?

Answer 12

Zone farther from star

Question 13

What are the requirements for life?

Answer 13

Carbon & Water

Question 14

Is interstellar travel possible?

Answer 14

No

Question 15

What are Professor Fortner’s dogs’ names?

Answer 15

Astro & Cosmo