AnswersAZ-Earth and Space Science ASpace Technology

Space Technology — Unit test Answers

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A
visible light
B
gamma rays
C
ultraviolet light
D
infrared radiation
2
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Which characteristic do Mercury and Mars share?

A
many moons
B
rocky surfaces
C
thick atmospheres
D
moderate temperature fluctuations
3

What force acts between Earth and the moon?

A
gravity
B
mass
C
motion
D
newtons
4

Which is a future NASA research project?

A
using a probe to collect data
B
conducting research from a space station
C
collecting samples on an asteroid
D
conducting a space mission with no people
5

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
6

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
7

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
8

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

A
gravity
B
inertia
C
motion
D
orbit
9

What is the Milky Way?

A
a spiral galaxy in which Earth is located
B
an elliptical galaxy in which Earth is located
C
an irregular galaxy in which Earth is located
D
the closest galaxy to the one in which Earth is located
10

In which direction does Earth rotate?

A
eastward around its axis
B
in an ellipse around the Sun
C
counterclockwise around the Sun
D
from north to south around its axis
11

Observable matter makes up about what percentage of the universe?

A
5%
B
10%
C
50%
D
95%
12

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.
13

Why did scientists struggle for thousands of years to accurately describe the solar system?

A
Venus has phases like the moon.
B
Many people spoke Italian and did not understand Latin.
C
The planets appeared to move backward in the sky occasionally.
D
Scientists could not explain why the Sun appeared to rise and set every day.
14

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
15

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.

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