AnswersFL-2001010-MJ EarthSpace Science AThe Expanding Universe

The Expanding Universe Answers

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1
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Which event led to the formation of our solar system?

A
A galaxy broke apart.
B
A massive star exploded.
C
A solar nebula collapsed.
D
Dark matter materialized.
2
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Which statement accurately describes the outer planets?

A
Pluto is one of the outer planets.
B
The outer planets are also called rocky planets.
C
The outer planets have thin atmospheres.
D
The outer planets have a high gravity due to their large size.
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

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
5

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.
6

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
7

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.
8

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.
9

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.
10

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

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