Deck 84: Dark Energy and the Fate of the Universe

Question 1

Dark matter makes up _____________ of the universe.

A) 23%
B) 90%
C) 73%
D) 0.5%

Answer 1

23%

Question 2

Heat death is

A) when a star ceases fusing any elements.
B) when the expansion of space gets so great that our galaxy is ripped apart.
C) when the universe recollapses into a hot, dense mass.
D) when all the available fuel in the universe is consumed.

Answer 2

when all the available fuel in the universe is consumed.

Question 3

What is the difference between dark matter and dark energy?

A) Dark matter exists today, whereas dark energy existed only in the distant past.
B) There is no difference.
C) Dark matter is attractive and slows the expansion. Dark energy is repulsive and accelerates the expansion.
D) Dark energy is the energy emitted by dark matter.

Answer 3

Dark matter is attractive and slows the expansion. Dark energy is repulsive and accelerates the expansion.

Question 4

Based on supernova studies, it appears the universe is ____.

A) curved
B) accelerating
C) closed
D) slowing down

Question 5

________________ is when there is no longer any source of power in the universe.

Question 6

________________ supernovae are important standard candles in cosmology.

Question 7

Dark energy is another name for a cosmological constant.

Question 8

As the expansion of the universe accelerates, parts of the universe that we cannot now see will become visible.