Astronomy Test 2 Study

Question 1

Nebular Theory

Answer 1

A theory besides the Big Bang.

Question 2

Nebula

Answer 2

A cloud of dust and gas.

Has mass and gravity.

Question 3

What are the steps of the Nebular Theory?

Answer 3

1. Solar system began as a nebula.
2. Nebula collapses from shock wave nebula explosion.
3. Gravity pulled 99% of matter to form the sun.
4. Center spun faster and faster.
5. Material became flat and formed a disk shape.
6. Material came together - becoming denser - and formed our sun, planets, etc.

Question 4

What is a galaxy?

Answer 4

Large-scaled group of stars bound together by gravitational attraction.

Question 5

What are the three types of galaxies?

Answer 5

Spiral, Elliptical, and Irregular.

Question 6

All about a spiral galaxy…

Answer 6

• Milky way
• Pinwheel shape
• 75%
• Sun is in one of the spiral arms.
• Arms rotate into the center of a galaxy.

Question 7

All about an Elliptical Galaxy…

Answer 7

• Spherical or disk-shaped.
• Contains little dust or gas.
• Older galaxies.
  20%

Question 8

All about an Irregular Galaxy…

Answer 8

• No definite shape.

- 5%

Question 9

What are the different Star Clusters?

Answer 9

Open and Globular Clusters.

Question 10

All about an Open Cluster…

Answer 10

• Loose-shaped group of stars.

- Located in the arms of a disk.

Question 11

All about a Globular Cluster…

Answer 11

• Spherical shaped.
• Found around a central core.
• Contains more stars.

Question 12

What is a Binary Star?

Answer 12

Pairs of stars that revolve around each other. Most stars are a part of this. (Our sun isn’t)