Name
Date
Period
Ch 18 L3 Lives of Stars 2 pts.
1a.
REVIEW How does a star form from a nebula?
b. SUMMARIZE What factor determines how long a star lives?
c. PREDICT A star is twice as massive as the sun. How will its lifespan compare?
d. Stars are born when
and how long a star lives depends on
What Happens to a Star When It Runs Out of Fuel? 2 pts.
2a.
REVIEW What determines if a star becomes a white dwarf, neutron star, or black hole?
b. PREDICT Which will the sun become: a white dwarf, neutron star, or black hole?
c. ANSWER
How do stars change over time?
d. After a star runs out of fuel, it becomes
Name
Date
Period
Ch 18 L3 Lives of Stars Understanding Main Ideas: Using Pencil Only
Fill in each blank with the correct letter from the diagram. 1 pt each
1. ___ Red giant or supergiant
2. ___ Where fusion begins
3. ___ Part of a nebula
4. ___ White dwarf, neutron star, or black hole
5. ___ The stage the sun is in
Building Vocabulary In the spaces below, write a definition for each of these terms. 2 pts
6. pulsar
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7. white dwarf
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8. nebula
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9. protostar
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10. supernova
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11. neutron star
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12. black hole
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Write the letter of the correct answer on the line at the left. 1 pt each
1. ___ A pulsar is a spinning
A black hole
B neutron star
C supernova
D white dwarf
2. ___ Which progression do astronomers
expect our sun to follow as it runs out
of fuel?
A red giant, white dwarf
B red giant, neutron star
C supergiant, supernova, white dwarf
D supergiant, supernova, black hole
3. ___ What determines the life cycle of
a star?
A gravity
B the type of protostar
C its mass
D its temperature
4. ___ When is a star born?
A when the nebula starts spinning
B when gas and dust start to contract
C when X-rays get emitted
D when nuclear fusion starts
Fill in the blank to complete each statement. 1 pt each
5.
Since no electromagnetic radiation escapes from a(n) _________________ _________________, astronomers
locate them by looking for X-rays from gas accelerating toward them.
6.
An explosion that occurs at the end of a massive star’s life is a(n) _________________.
7.
A(n) _________________ is a large cloud of gas and dust in space.
8.
A low- or medium-mass star becomes a(n) __________________________________ at the end of its life.
9.
A(n) _________________ appears to emit regular bursts of radio waves.
10.
A(n) __________________________________ forms from the leftover material from a supernova; it may contain as
much as three times the mass of the sun.