31.3 and 31.4

Question 1

galaxy

Answer 1

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

Question 2

milky way

Answer 2

the galaxy we live in

Question 3

local group

Answer 3

milky way is park of the local group and includes about 50 other galaxy

Question 4

cosmology

Answer 4

the study of how the universe became

Question 5

big bang theory

Answer 5

explanation of how the galaxy is formed

Question 6

cosmic background radiation

Answer 6

residual microwave radiation the solar system gave off when it was young

Question 7

dark matter

Answer 7

an invisible form of matter that doesn’t emit any detectable electromagnetic

Question 8

dark energy

Answer 8

an invisible form of energy that creates a repulsive force

Question 9

what are the 3 shapes of gallaxys

Answer 9

spiral, elliptical, irregular

Question 10

what is our solar system in

Answer 10

milky way galaxy

Question 11

what shape is the milky way galaxy

Answer 11

spiral

Question 12

about how many galaxy’s are in the local group

Answer 12

about 50

Question 13

what are the 2 largest galaxy in the local group

Answer 13

milky way and Andromeda

Question 14

where are we located in the milky way galaxy

Answer 14

in one of the arms

Question 15

how long ago did the big bang occur

Answer 15

13.7 billion years ago

Question 16

what is the name of the effect in the change of light wave lengths

Answer 16

Doppler effect

Question 17

what is the universe made of

Answer 17

dark matter and regular matter