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15
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How do stellar spectra provide evidence that stars are actually moving?
dark line spectra reveal a star's composition
light separates into different wavelengths
Doppler shifts occur in the star's spectrum
long exposure photos show curved trails
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15
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A main-sequence star generates energy by fusing...
nitrogen into iron
nitrogen into carbon
helium into carbon
hydrogen into helium
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The heaviest element formed in the core of a star is...
iron
helium
nitrogen
carbon
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eraser
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seesaw
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rocket
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banana
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15
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Stars appear to move in circular paths through the sky because...
the Milky Way is a spiral galaxy
the stars orbit Polaris
Earth orbits the sun
Earth rotates on its axis
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15
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Northern lights and southern lights are other names for
eclipses
granulations
auroras
prominences
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The surface temperature of a star is plotted against its luminosity on the
Doppler effect.
cosmic background radiation map.
H-R diagram.
parallax graph.
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15
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According to Einstein's theory of relativity, in the formula E=mc2, the c stands for
the speed of light
core
the length of time
circumstellar
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15
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Shadows change length during the day because....
the sun is moving
because the moon gets in front of the sun.
because people move.
of the earth's position in front of the sun.
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boom
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fairy
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25
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fairy
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banana
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We do not see other stars during the day because...
our star the sun is too bright.
they set in the west.
they set in the east.
they are too far away.
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baam
Lose 15 points!
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gift
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rocket
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banana
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15
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What happens to main sequence stars (the sun) when energy from fusion is no longer available?
they collapse and become white dwarfs
they expand and become supergiants
they switch to fission reactions
they contract and turn into neutron stars
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15
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At night we can see over _____________ stars.
2,000, 000
2
20
2,000
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15
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What are binary stars?
stars with two poles
pairs of stars held motionless by gravity
stars like the sun and Earth
pairs of revolving stars held together by gravity
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trap
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seesaw
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gift
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lifesaver
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