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Star Formation
Test Description: Answer review questions about stars.
Instructions: Answer all questions to get your test result.
1) Approximately how old is the Sun?
A
10.2 billion years
B
2.1 billion years
C
1.4 billion years
D
4.6 billion years
2) What is the secondmost abundant element in the universe?
A
H
B
C
C
He
D
Fe
3) What round object is formed when gas and dust are pulled together by gravity, but before nuclear fusion has begun?
A
protostar
B
nebula
C
star
D
giant molecular cloud
4) What round object is formed when gas and dust are pulled together by gravity, but before nuclear fusion has begun?
A
star
B
giant molecular cloud
C
protostar
D
nebula
5) When does a star reach equilibrium?
A
when the amount of hydrogen equals the amount of helium
B
when gravity is balanced by the outward force of nuclear fusion
C
when it reaches the point where nuclear fusion is about to begin
D
When it no longer produces any antimatter
6) A ___________ is a massive ball of hot gas (plasma) that creates its own energy via nuclear fusion
A
giant molecular cloud
B
star
C
nebula
D
protostar
7) In nuclear fusion reaction, the mass of the products is less than the mass of the reactants. What happens to this "missing mass"
A
It turns into energy
B
It turns into matter
C
It turns into matter and antimatter
D
It turns into antimatter
8) What do most stars originally form as?
A
binary stars or multiple stars
B
protostars
C
neutron stars
D
photon stars
9) What is the most abundant element in the universe?
A
H
B
C
C
He
D
Fe
10) Stars are born, they go through changes, and then they ________.
A
shrink
B
die
C
are reborn
D
grow
*select an answer for all questions
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