31.3 & 31.4 Flashcards Preview

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Flashcards in 31.3 & 31.4 Deck (17)
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1
Q

Galaxy

A

Large group of stars, dust, and gas held together by gravity

2
Q

Milky Way

A

Large galaxy our solar system is in it

3
Q

Local Group

A

Large group of galaxies that includes the Milky Way

4
Q

Cosmology

A

The study of how the universe began, how it changes/continues to change, and what it’s made up of

5
Q

Big Bang Theory

A

All matter and energy in the universe were compressed into a single point that began to expand outward

6
Q

Cosmic Background Radiation

A

The residual microwave radiation from the formation of the universe

7
Q

Dark Matter

A

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

8
Q

Dark Energy

A

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

9
Q

What are the three shapes a galaxy could be?

A

Spiral, Elliptical, Irregular

10
Q

Which galaxy is our solar system located in?

A

Milky Way

11
Q

What shape is the Milky Way galaxy?

A

Spiral

12
Q

How many galaxies are in the Local Group?

A

50

13
Q

What are the two largest galaxies in the Local Group?

A

Andromeda, Milky Way

14
Q

Where are we located in the Milky Way galaxy?

A

The center of one of the arms

15
Q

How long ago did the Big Bang happen?

A

13.7 billion years ago

16
Q

What does the Doppler Effect do?

A

Shifts occur in light as well as sound

17
Q

What is the universe made of?

A

Regular matter, and Dark matter