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WorksheetsStars Crash Course
Total questions: 21
Worksheet time: 8mins
Name
Class
Date
1.
What are the two opposing forces that keep stars between collapsing and inflating?
a)
centripetal force and electron degeneracy force
b)
centripetal force and the pressure of hot gasses
c)
gravity and electron degeneracy force
d)
gravity and the pressure of hot gasses
2.
Hydrogen fusion makes helium. "Triple-alpha" helium fusion makes ___
a)
lithium
b)
boron
c)
carbon
d)
sulfur
3.
Carbon will fuse in the core of a star that has more relative mass than ___
a)
about four times the Sun's mass
b)
about eight times the Sun's mass
c)
about 18 times the Sun's mass
d)
about 40 times the Sun's mass
4.
If a star has more than about eight times the Sun's mass, it can fuse carbon into ___
a)
neon, magnesium and some sodium
b)
oxygen, magnesium and some sodium
c)
neon, oxygen and some sodium
d)
neon, magnesium and some oxygen
5.
A star becomes a ticking time-bomb once silicon starts fusing into ___
a)
calcium
b)
cadmium
c)
iron
d)
lead
6.
When helium fusion begins, a massive, blue, main sequence star will become ___
a)
a red dwarf
b)
a blue dwarf
c)
a blue giant
d)
a red super giant
7.
Which bright star, in the constellation Orion, is a red super giant?
a)
Rigel
b)
Betelgeuse
c)
Bellatrix
d)
Saiph
8.
VY Canis Majoris, the largest known star, is two billion km across and is classified as ___
a)
a hypergoliath
b)
a mega-titan
c)
a hypergiant
d)
a mega-leviathan
9.
The core of a supergiant star looks like an onion because it has ___
a)
white inner layers
b)
a brown outer layer
c)
multiple layers
d)
a bulb shape
10.
The Sun can fuse hydrogen for over ten billion years, while a star twice as massive runs out of hydrogen in ___
a)
two billion years
b)
five billion years
c)
the same amount of time
d)
twenty billion years
11.
In massive stars, the fusion of which element occurs at a "ridiculously high rate"?
a)
carbon
b)
neon
c)
oxygen
d)
silicon
12.
Which element, in its creation, removes energy from a star's core and also sucks up electrons?
a)
neon
b)
oxygen
c)
silicon
d)
iron
13.
As the core collapses, if a star has less than twenty times the Sun's mass, it becomes ___
a)
a white dwarf
b)
a neutron star
c)
a brown dwarf
d)
a black hole
14.
As the core collapses, if a star has more than twenty times the Sun's mass, it becomes ___
a)
a white dwarf
b)
a neutron star
c)
a planetary nebula
d)
a black hole
15.
The collapse of a star's core generates vast numbers of elusive subatomic particles called ___
a)
neutrinos
b)
neutrons
c)
photons
d)
quarks
16.
When the vast wave of neutrinos slams into the oncoming outer material, the explosion is called ___
a)
a supernova
b)
a super-aster
c)
a meganova
d)
a mega-aster
17.
During a supernova, the expanding gas blasts outward at ___
a)
2% of the speed of light
b)
10% of the speed of light
c)
20% of the speed of light
d)
40% of the speed of light
18.
The Crab Nebula, formed from expanding material, is called ___
a)
an open cluster
b)
a planetary nebula
c)
a supernova remnant
d)
a globular cluster
19.
Betelgeuse will certainly explode some day, but it's ___
a)
too far away to hurt us
b)
too far away to see
c)
too small to be a supernova
d)
too small too see
20.
The creation of heavy elements during a supernova explosion is called ___
a)
explosive amalgamation
b)
fusion amalgamation
c)
explosive nucleosynthesis
d)
nuclear coalescence
21.
The majority of heavy elements in the universe were created and scattered by ___
a)
supernovae
b)
the Big Bang
c)
planetary nebulae
d)
star formation
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