Chapter 31.3 & 31.4

Question 1

Galaxy

Answer 1

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

Question 2

Milky Way

Answer 2

our galaxy, our solar system, including our only star, the Sun, is part of a large group of stars, dust and gas

Question 3

Local Group

Answer 3

the Milky Way is part of a larger group of galaxies

Question 4

Cosmology

Answer 4

the study of how the universe began, how it continues to change, and what it is made of

Question 5

Big Bang Theory

Answer 5

all matter and energy in the universe were compressed into a single point

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

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

Question 9

What are three galaxy shapes?

Answer 9

spiral, elliptical, irregular

Question 10

What shape is the Milky Way galaxy?

Answer 10

spiral

Question 11

How many galaxies are in our Local Group?

Answer 11

about 50

Question 12

What are the two largest galaxies in the Local Group?

Answer 12

Andromeda and the Milky Way

Question 13

Where are we located at in the Milky Way?

Answer 13

in the center of one of the arms

Question 14

How long ago did the Big Bang occurred ago?

Answer 14

13.7 billion years ago

Question 15

What is the name of the effect that shows the changes in light waves?

Answer 15

The doppler effect

Question 16

What is the universe made of?

Answer 16

regular matter and dark matter