Answers2001310 Earth Science Sem 1 - ReevesThe Expanding Universe

The Expanding Universe Answers

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1
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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.
2
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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.
3

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.
4

Which discovery by astronomer Vera Rubin helped prove the existence of dark matter?

A
Galaxies exist outside of the Milky Way.
B
The expansion of the universe is accelerating.
C
Galaxies spin faster than they should, based on their visible matter.
D
Gas giants form farther from the Sun, where temperatures are cooler.
5

Which is one piece of information that astronomers use to calculate the age of the universe?

A
dark energy
B
the age of rocks on Earth
C
the current motion of inner planets
D
patterns of background radiation
6

In 1998, scientists discovered that the expansion of the universe has been accelerating.What force is causing this phenomena?

A
dark energy
B
Hubble’s law
C
the Doppler effect
D
background radiation
7

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
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

Which statement accurately describes the inner planets?

A
Uranus is one of the inner planets.
B
The inner planets formed when the solar system cooled.
C
The inner planets are also called terrestrial planets.
D
The inner planets are larger than the outer planets.

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The Expanding Universe Answers — 2001310 Earth…