Answers2001310 Earth Science Sem 1 - ReevesThe Expanding Universe

The Expanding Universe Answers

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1
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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.
2
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What happens in the process of gravitational condensation?

A
An object decreases in size due to the collision of materials.
B
An object increases in size due to the addition of materials.
C
Gas particles are formed from solar nebula materials.
D
Solid particles are formed from solar nebula materials.
3

What is the correct order of processes in the accretion of planetesimals?

A
Masses of matter form around dust grain, masses of matter collide, and atoms and molecules are added to dust grain.
B
Masses of matter collide, masses of matter form around dust grain, and atoms and molecules are added to dust grain.
C
Atoms and molecules are added to dust grain, masses of matter form around dust grain, and masses of matter collide.
D
Masses of matter collide, atoms and molecules are added to dust grain, and masses of matter form around dust grain.
4

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

A
Jupiter
B
Mars
C
Neptune
D
Saturn
6

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
7

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
8

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.
9

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.
10

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.

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