Star Formation: Question Preview (ID: 9788)


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Approximately how old is the Sun?
a) 1.4 billion years
b) 2.1 billion years
c) 4.6 billion years
d) 10.2 billion years

What is the secondmost abundant element in the universe?
a) H
b) C
c) Fe
d) He

What round object is formed when gas and dust are pulled together by gravity, but before nuclear fusion has begun?
a) star
b) nebula
c) protostar
d) giant molecular cloud

What round object is formed when gas and dust are pulled together by gravity, but before nuclear fusion has begun?
a) star
b) nebula
c) protostar
d) giant molecular cloud

When does a star reach equilibrium?
a) When it no longer produces any antimatter
b) when the amount of hydrogen equals the amount of helium
c) when gravity is balanced by the outward force of nuclear fusion
d) when it reaches the point where nuclear fusion is about to begin

A ___________ is a massive ball of hot gas (plasma) that creates its own energy via nuclear fusion
a) star
b) nebula
c) protostar
d) giant molecular cloud

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 matter
b) It turns into energy
c) It turns into antimatter
d) It turns into matter and antimatter

What do most stars originally form as?
a) protostars
b) photon stars
c) neutron stars
d) binary stars or multiple stars

What is the most abundant element in the universe?
a) H
b) C
c) Fe
d) He

Stars are born, they go through changes, and then they ________.
a) die
b) grow
c) shrink
d) are reborn

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