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20-4
Test Description: 20-4
Instructions: Answer all questions to get your test result.
1) What is an irregular galaxy?
A
No shape, little interstellar matter
B
Spiral arms made of gas, dust, and stars
C
Have little gas or dust, no spiral arms, spherical or egg shaped, often reddish
D
Black hole
2) What do many astronomers think is at the center of our galaxy?
A
Sun
B
Black hole
C
White dwarf
D
Stars
3) What are quasars?
A
planets
B
stars
C
Universal things
D
Quasi-stellar objects
4) What do astronomers think quasars are the beginnings of?
A
Stars
B
Black holes
C
Planets
D
Galaxies
5) Describe the structures of a quasar.
A
Huge central black hole, large disk of gas and dust around it
B
Nebula
C
Huge central disk of gas and dust surrounded by a black hole
6) What are two ways that galaxies change over time?
A
Use up their matter (no new stars) and collisions with other galaxies
B
Collisions with other galaxies and supernovas
C
Combustion and collisions with other galaxies
D
Supernovas and combustion
7) If you observe a galaxy that is 4 million ly away, you are observing light that left that galaxy how long ago?
A
4 million years
B
2 million years
C
4 billion years
D
2 billion years
8) What will our sun form when it dies?
A
Supernova
B
Red giant
9) How many more years does our sun have to live?
A
1
B
5 million
C
10 million
D
5 billion
10) What stage is our sun in now?
A
Geriatric
B
Near death
C
Infancy
D
Midlife
*select an answer for all questions
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