Test #4 Objectives: 1

Question 1

Globular Clusters

Answer 1

100’s-1000’s stars. Old and long lived stars. In the halo of the galaxy
(No upper-left Main Sequence)

Question 2

Open Clusters

Answer 2

100’s stars. Young and short lived stars. In the disk of the galaxy
(Nearly complete Main Sequence)

Question 3

Effects of interstellar dust on light?

Answer 3

Dimming/reddening effect

Question 4

Emission Nebula explanation and example

Answer 4

(Orion)

Question 5

Reflection Nebula explanation and example

Answer 5

(Dumbbell)

Question 6

Absorption Nebula explanation and example

Answer 6

(Horsehead)

Question 7

How far are most naked eye stars?

Answer 7

1000 Lightyears from the Sun

Question 8

How is 21 cm produced?

Answer 8

When a hydrogen atom’s electron reverse’s orientation

Question 9

Why is 21 cm radiation important?

Answer 9

It penetrates dust where visible light can’t

Question 10

How does the Sun move through the galaxy?

Answer 10

Up and down like a merry-go-round, every 230 million years.

Question 11

Number of stars in the Milky Way?

Answer 11

200-400 billion

Question 12

Distance to Andromeda?

Answer 12

2.5 million light years

Question 13

Distance to center of Milky Way?

Answer 13

30,000 light years

Question 14

Name a satellite galaxy

Answer 14

Snickers

Question 15

Hubble’s Law is?

Answer 15

The greater the red shift, the greater the distance.