Answers2001310 Earth Science Sem 1 - ReevesThe Expanding Universe

The Expanding Universe Answers

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1
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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.
2
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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.
3

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

A
Jupiter
B
Mars
C
Neptune
D
Saturn
6

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.
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

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
9

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
10

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.

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