31.3 and 4

Question 1

galaxy

Answer 1

large group of star, dust, gas held together by gravity

Question 2

Local group

Answer 2

group of about 50 galaxies including the Milky Way

Question 3

Milky way

Answer 3

spiral galaxy that is about 100,000 light years in diameter and contains from 200 to 400 billions of stars including the sun and our galaxy

Question 4

Big Bang theory

Answer 4

theory that about 13.7 billion years ago the entire universe was contained in a single point that began expanding outward

Question 5

cosmic background radiation

Answer 5

residual radiation from the formation of the universe

Question 6

cosmology

Answer 6

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

Question 7

dark energy

Answer 7

energy that might be causing the accelerating expansion of the universe

Question 8

dark matter

Answer 8

type of matter that cannot be seen and can only be detected by it gravitational effects

Question 9

what shape is the Milky Way Galaxy

Answer 9

spiral

Question 10

how many galaxies are found in the local group

Answer 10

50

Question 11

what are the two largest galaxies

Answer 11

milky way and andrometa

Question 12

how long ago did the big bang theory

Answer 12

about 13.7 billion years ago

Question 13

what colors the wave lengths

Answer 13

red and blue

Question 14

what is the effect called when there are a shift in light wave lengths

Answer 14

doppler affect