Chapter 31.3 & 31.4

Question 1

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

Answer 1

galaxy

Question 2

V: the Sun is part of a larger group of stars, dust, and gas called…

Answer 2

the Milky Way (our galaxy)

Question 3

V: the Milky Way is part of a group of galaxies called…

Answer 3

the Local Group

Question 4

V: the study of how that universe began, how it continues to change, and whats it’s made of is called…

Answer 4

cosmology

Question 5

V: all matter and energy in the universe were compressed into a single point, which expanded outwards 13.7 billion years ago, this theory is called…

Answer 5

the Big Bang theory

Question 6

V: ____ ____ ____ is the residual microwave radiation emitted when the universe was young

Answer 6

Cosmic background radiation

Question 7

V: an invisible form of matter that does not emit any detectable electromagnetic energy of it’s own

Answer 7

dark matter

Question 8

V: an invisible from of energy that creates a repulsive force causing the universe to expand at a faster rate

Answer 8

dark energy

Question 9

What at the three galaxy shapes?

Answer 9

spiral, ellipse (elliptical), and irregular

Question 10

What shape is the Milky Way galaxy?

Answer 10

spiral

Question 11

How many galaxies are found in the Local Group?

Answer 11

50

Question 12

What are the two biggest galaxies found in the Local Group?

Answer 12

the Milky Way and Andromeda

Question 13

What is the Universe made of?

Answer 13

regular matter and dark matter

Question 14

How long ago did the Big bang occur?

Answer 14

13.7 billion years

Question 15

What is the shift in light waves called?

Answer 15

the Doppler effect