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Question
Describe our location in the Milky Way.Answer
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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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Hubble divided the spirals into normal and ________ categories.
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Galaxies that look like huge globular clusters are Hubble type ________.
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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.
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In active galaxies, their central engines may be temporarily fed by
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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.