Answers2001310 Earth Science Sem 1 - ReevesThe Expanding Universe

The Expanding Universe Answers

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1
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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.
2
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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
3

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.
4

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.
5

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.
6

Which is one of Edwin Hubble’s findings that supports the big bang theory?

A
The universe started at a central point.
B
Planetesimals formed in debris disks.
C
Visible matter only makes up about 5% of the universe.
D
The Milky Way is the only galaxy in the universe.
7

Which planet formed near the Sun where the solar system’s temperatures were very high?

A
Jupiter
B
Mars
C
Neptune
D
Saturn
8

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
9

About how long ago did our solar system start to form?

A
About 5 million years ago
B
About 14 million years ago
C
About 5 billion years ago
D
About 14 billion years ago
10

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.

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