AnswersAZ-Earth and Space Science A SC301Stars

Stars Answers

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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.
A
A star will not form. ✓ Correct
A
A protostar will form.
A
A nebula will not form.
2
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Which factor causes gas and dust to pull together during the first stage of star formation?

d
density
g
gravity
h
heat
p
pressure
3

first

T
The star’s core shrinks.
T
The star becomes a black hole.
T
The star becomes a white dwarf.
T
The star’s outer layer drifts away.
4

Which object forms when a supergiant explodes?

a
a red giant
a
a protostar
a
a white dwarf
a
a neutron star
5

What is the main element that stars are made of?

h
helium
h
hydrogen
m
magnesium
s
sodium
6

Which event signals the birth of a star?

A
A core shrinks and explodes in a supernova.
A
A protostar collapses, becoming dense and hot.
E
Extreme heat and pressure causes nuclear fusion.
A
A mass of gas and dust grows and forms a protostar.
7

What is the Sun classified as on the Hertzsprung-Russell diagram?

r
red giant
s
supergiant
w
white dwarf
m
main sequence star
8

What causes a star to shine brightly?

t
the color that is produced
t
the energy that is released
t
the amount of gravity that is present
t
the types of elements that are present
9

Which object is created during the formation of a star?

a
a nebula
a
a protostar
a
a supergiant
a
a supernova
10

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

b
brightness
c
color
c
composition
s
size
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

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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