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