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The Expanding Universe Answers

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1
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What would most likely cause the future acceleration of the expansion of the universe?

A
radiation from the Sun
B
the existence of background radiation
C
the continued existence of dark energy
D
light shifts identified by the Doppler effect
2
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Which two objects in space formed from the huge disk of ice and debris beyond the outer planets?

A
Pluto and comets
B
comets and Neptune
C
Neptune and a solar nebula
D
a solar nebula and planetesimals
3

Which evidence supports the big bang theory?

A
Planetesimals form in debris disks.
B
Most galaxies are moving toward us.
C
Uniform background radiation is detected in every direction.
D
Galaxies spin faster than they should based on visible matter.
4

Which statement accurately describes planetesimals?

A
They are the origins of planets.
B
They formed from ice and rocks.
C
They were created during the big bang.
D
They contain 98% of matter in the solar system.
5

Which statement accurately describes dark matter?

A
It is the same as dark energy.
B
It is well understood by scientists.
C
It does not emit electromagnetic radiation.
D
It can be observed by shifts in red and blue light.
6

Which statement accurately describes how the understanding of the Doppler effect is applied to the study of galaxies?

A
It was used by Hubble to measure the velocities of galaxies.
B
It was used to monitor galaxy motion through changes in sound waves.
C
It indicates a galaxy moving toward Earth through red shift.
D
It indicates a galaxy moving away from Earth through blue shift.
7

In which order did the events forming our solar system occur?

A
The solar nebula became hot and dense pulling in more gas.This flattened into a rotating disk. It spun faster and faster, forming the Sun.
B
Gas was pulled toward the center, forming the Sun. Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster.
C
Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. Gas was pulled toward the center, forming the Sun.
D
The solar nebula spun faster and faster and flattened into a rotating disk. Most of the gas was pulled toward the center, where it became hot and dense, forming the Sun.
8

Which is currently the most supported theory about the future of the universe?

A
The universe could remain exactly as it is today.
B
The universe may continue to expand.
C
Stars could burn out, causing the universe to become dark and cold.
D
Gravity could pull galaxies back together, causing a reverse of the big bang.
9

Which correctly lists the two elements that make up the empty space in the universe?

A
ice and debris
B
debris and dark matter
C
dark matter and dark energy
D
dark energy and dust
10

There is a theory that gravity could pull galaxies back together, causing a reverse big bang.Which observation makes this theory less likely than the idea that the universe may continue to expand?

A
Background radiation is present.
B
Galaxies exist outside of the Milky Way.
C
The expansion of the universe is accelerating.
D
Gas giants form farther from the Sun, where temperatures are cooler.

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