Answers2627 EARTH SPACE SCIENCE AGravity and Motion

Gravity and Motion — Unit test Answers

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1
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What term describes the moon’s path around Earth?

A
eclipse
B
phase
C
revolution
D
rotation
2
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Lori attended a lecture about the Sun, and the presenter had placed this image on the wall. Which layer of the Sun could this image be referring to?

Question illustration
A
the convection zone, because it shows how energy moves in a convection current
B
the radiation zone, because it shows how energy is transferred through radiation
C
the core, because it shows how the Sun creates energy through the process of nuclear fusion
D
the chromosphere, because it shows how energy is emitted by the atmosphere of the Sun
3

What is the correct order of star colors from hottest to coolest?

w
white, yellow, red, blue
y
yellow, orange, white, red
r
red, orange, yellow, blue-white
b
blue, white, yellow-white, orange
4

Which list correctly orders the outer planets from least to greatest distance from the Sun?

A
Jupiter, Saturn, Uranus, Neptune
B
Saturn, Jupiter, Uranus, Neptune
C
Jupiter, Saturn, Neptune, Uranus
D
Neptune, Uranus, Saturn, Jupiter
5

Which is a factor that keeps Earth in orbit around the Sun?

A
the orbital path of the moon
B
the gravitational pull of the Sun
C
the continuous motion of the universe
D
Earth’s changing speed and direction
6

Scientists believe that some mass extinction events are possibly caused by asteroids, volcanic activity, or climate change. How many mass extinctions have occurred on Earth in the last 4.6 billion years?

A
0
B
1
C
5
D
10
7

Which causes objects in the universe to resist a change in speed or direction?

A
gravity
B
inertia
C
motion
D
orbit
8

Which type of star will become a black hole when it dies?

A
a protostar
B
a supergiant
C
a white dwarf
D
a red dwarf
9

What was discovered in 1965 and is believed to be leftover thermal energy from the big bang?

A
red shift
B
the Eagle Nebula
C
the Doppler effect
D
background radiation
10

Why are there two high tides a day about 12 hours apart from each other?

E
Earth revolves around the Sun once during that time.
E
Earth rotates entirely on its axis once during that time.
T
The moon revolves around Earth once during that time.
T
The moon’s orbit is in line with Earth’s orbit twice a day.
11

About how old is the Sun?

A
1.2 billion years
B
4.6 billion years
C
6.4 billion years
D
8.2 billion years
12

Which remains the same as the distance of an object from Earth changes?

A
size of the force
B
strength of gravity
C
mass of the object
D
weight of the object
13

Which term defines a star system with two stars?

A
binary star system
B
eclipse star system
C
open cluster star system
D
globular cluster star system
14

Which is one physical property that all stars have?

A
They are made of gases.
B
They shine very brightly.
C
They have a triangle shape.
D
They contain iron in their cores.
15

Which quantity does a light-year measure?

A
distance
B
speed
C
time
D
volume
16

Which is the final event that occurs when a star is forming?

A
The outer layer of the star expands.
B
Gravity pulls gas and dust together.
C
A black hole forms as the core collapses.
D
Nuclear fusion begins under high pressure.
17

Whose data did Kepler use to construct the laws of planetary motion?

A
Aristarchus’s
B
Aristotle’s
C
Brahe’s
D
Copernicus’s
18

Which type of star will become a black hole when it dies?

A
a protostar
B
a supergiant
C
a white dwarf
D
a red dwarf
19

The sudden eruptions of energy from a small area of the Sun’s surface are known as

A
solar flares.
B
sunspots.
C
prominences.
D
solar winds.
20

If astronomers discovered a new inner planet in the solar system, which characteristic would it most likely have?

A
large size
B
gaseous composition
C
many moons
D
fast revolution

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