Answers2026-27 AL-Earth and Space ScienceThe Sun

The Sun — Unit test Answers

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1
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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.
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

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
4

Which quantity does a light-year measure?

A
distance
B
speed
C
time
D
volume
5

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.
6

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
7

Which is a type of star system?

A
dim stars
B
solar system planets
C
wobbling stars
D
globular clusters
8

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
9

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.
10

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
11

Solar winds have an influence all the way to about 160 AU from the Sun. About how many kilometers is that?

A
24,000,000,000 km
B
48,000,000,000 km
C
240,000,000,000 km
D
480,000,000,000 km
12

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

A
white, yellow, red, blue
B
yellow, orange, white, red
C
red, orange, yellow, blue-white
D
blue, white, yellow-white, orange

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