Chapter 31.3 & 31.4

Question 1

Galaxy

Answer 1

large group of stars, dust, and gas held together by gravity.

Question 2

Milky Way

Answer 2

a larger group of stars, dust, and gas. Includes our solar system and our Sun

Question 3

Local Group

Answer 3

Group of galaxies. Contains 50 galaxies spread out over a distance of 10 million light years.

Question 4

Cosmology

Answer 4

the study of how the universe began and whats it made up of.

Question 5

Big bang theory

Answer 5

all matter and energy in the universe were compressed into a single point, which then started to expand outward about 13.7 billion years ago.

Question 6

Cosmic background radiation

Answer 6

is the residual microwave radiation emitted when the universe was very young

Question 7

Dark matter

Answer 7

is an invisible form of matter that does not emit any detectable electromagnetic energy of its own

Question 8

Dark energy

Answer 8

an invisible form of energy that creates a repulsive force causing the universe to expand at a faster rate.

Question 9

What are the three shapes a galaxy can be?

Answer 9

spiral, elliptical, and irregular

Question 10

which galaxy is our solar system in?

Answer 10

Milky Way

Question 11

what shape is the Milky Way galaxy?

Answer 11

Spiral

Question 12

How many galaxies are in the local group

Answer 12

50

Question 13

what are the two largest galaxies in the local group

Answer 13

Milky Way and andromdea

Question 14

where at are we located in the milky way galaxy

Answer 14

center of one of the arms