Stars and the Universe Review

How old is the universe?

• 4.6 billion years

• 13.7 billion years

• 4.6 million years

• 13.7 million years

According to the big bang theory, how did the universe begin?

• Collapsing core of a supergiant star

• Rapidly spinning black hole

• Giant cloud of gas and dust

• Extremely small, dense, and hot point of pure energy

What does a light-year measure?

• Distance

• Time

• Temperature

• Brightness

What kind of nuclear reaction powers stars?

• Radioactive decay

• Nuclear fission

• Nuclear fusion

• Strong nuclear force

What is one of the three elements formed during the big bang?

• Carbon

• Iron

• Boron

• Hydrogen

How will our sun eventually die?

• Supernova

• White dwarf

• Giant star

• Black hole

What happens next after a very massive star fuses most of its mass into iron?

• The core collapses then explodes in a supernova

• The core collapses then becomes a white dwarf

• The core collapses into a black hole

• The core collapses then expands into a supergiant

What kind of stars form carbon during their giant phase?

• Stars like our sun

• Stars 8-20 times more massive than our sun

• Stars more than 20 times more massive than our sun

• All of the above

What kind of stars do not form the elements between carbon and iron during their giant phase?

• Stars like our sun

• Stars 8-20 times more massive than our sun

• Stars more than 20 times more massive than our sun

• All of the above

What observation supports the big bang theory by showing that most light in the early universe was released at the same time?

• Gamma radiation is nearly uniform throughout the universe

• Gamma radiation is much stronger in areas near the big bang

• Cosmic microwave background radiation is nearly uniform throughout the universe

• Cosmic microwave background radiation is much stronger in areas near the big bang