AnswersAZ-Earth and Space Science A SC301Stars

Lesson 6.6 Life Cycle of Stars Answers

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1
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What is the main element that stars are made of?

A
helium
B
hydrogen
C
magnesium
D
sodium
2
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What causes a star to shine brightly?

A
the color that is produced
B
the energy that is released
C
the amount of gravity that is present
D
the types of elements that are present
3

Which event takes place first in the stages before the birth of a star?

A
Gravity pulls gas and dust together.
B
A protostar forms as mass increases.
C
Nuclear fusion begins under high pressure.
D
A protostar collapses and becomes denser.
4

Which characteristic is used to measure the amount of light radiated by a star?

A
size
B
color
C
luminosity
D
temperature
5

Which property of a star is closely related to its temperature?

A
brightness
B
color
C
composition
D
size
6

How is the Sun classified?

A
as a giant star
B
as a medium star
C
as a white dwarf
D
as a neutron star
7

Which color are the hottest stars?

A
blue
B
orange
C
red
D
yellow
8

What happens first when a star begins to run out of fuel?

A
The star’s core shrinks.
B
The star becomes a black hole.
C
The star becomes a white dwarf.
D
The star’s outer layer drifts away.
9

Which event signals the birth of a star?

A
A core shrinks and explodes in a supernova.
B
A protostar collapses, becoming dense and hot.
C
Extreme heat and pressure causes nuclear fusion.
D
A mass of gas and dust grows and forms a protostar.
10

What happens first when a star begins to run out of fuel?

A
The star’s core shrinks.
B
The star becomes a black hole.
C
The star becomes a white dwarf.
D
The star’s outer layer drifts away.
11

Which event takes place first in the stages before the birth of a star?

A
Gravity pulls gas and dust together.
B
A protostar forms as mass increases.
C
Nuclear fusion begins under high pressure.
D
A protostar collapses and becomes denser.
12

What is the main element that stars are made of?

A
helium
B
hydrogen
C
magnesium
D
sodium
13

How is the Sun classified?

A
as a giant star
B
as a medium star
C
as a white dwarf
D
as a neutron star
14

Which event signals the birth of a star?

A
A core shrinks and explodes in a supernova.
B
A protostar collapses, becoming dense and hot.
C
Extreme heat and pressure causes nuclear fusion.
D
A mass of gas and dust grows and forms a protostar.
15

Some objects in space are created from clouds of gas and dust.What will happen if the cloud does not have enough mass?

A
A core will form.
B
A star will not form.
C
A protostar will form.
D
A nebula will not form.
16

What is the initial stage of all stars?

A
nebula
B
black hole
C
supernova
D
white dwarf
17

Which factor causes gas and dust to pull together during the first stage of star formation?

A
density
B
gravity
C
heat
D
pressure
18

Which color are the hottest stars?

A
blue
B
orange
C
red
D
yellow
19

Which object forms when a supergiant explodes?

A
a red giant
B
a protostar
C
a white dwarf
D
a neutron star
20

How do spectrographs help astronomers classify stars?

A
They determine the size of stars.
B
They evaluate the color of stars.
C
They measure the brightness of stars.
D
They analyze the composition of stars.

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