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Question
The relation between the Doppler shift of galaxies and their distances is called ________.Answer
This answer is hidden. It contains 11 characters.
Related questions
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Active galaxies emit most of their energy in ________ wavelengths than visible.
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A galaxy with a blueshift is moving ________ Earth.
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The Tully-Fisher relation uses the rotational speed of the galaxy to measure its ________.
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Our own Milky Way's Hubble class, according to the best data, is ________.
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The spiral arms are blue from the presence of Population ________ stars in them.
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When mass is accreted into a black hole, what fraction of the total mass-energy can be radiated away?
A) 0.007%
B) 0.08%
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Why is the energy source for active nuclei like Seyferts thought to be compact?
A) The sources appear to be single stars in photos.
B) Their energy appears to be non-stellar synchrotron radiation.
C) The light can vary over short time intervals.
D) We know the masses of the black holes that lurk there, and can find their radii.
E) They are all strong radio sources, with assigned frequencies by their sizes.
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In active galaxies, their central engines may be temporarily fed by
A) a sudden surge of star formation.
B) a series of supernovae around the core.
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D) a close encounter with a neighbor galaxy.
E) the fusion of helium into carbon in their cores.
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Describe the cycle of life and death we observe in the spiral arms.
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Compare the way an optical and radio astronomer would map the Galaxy.
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Why aren't there young stars in the halo?
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What advantage do radio astronomers have over optical ones in mapping the entire Milky Way?
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How did Herschel try to map our Galaxy 200 years ago, and why did he fail?
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Counting only the material between us and the galactic Center, we measure a mass of ________ billion Suns.
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The ________ is the spherical outer portion of the Galaxy, including the orbits of the globular clusters and most dark matter.
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Virtually the entire disk of the Galaxy has been mapped using the ________ wavelength.