Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 km/s must be _______________ Mpc from Earth. (Express your answer as a whole number of Mpc)
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Question 2The Chandra observatory uses ________________ mirrors in which the X-rays reflect at shallow angles from the polished inside of the mirrors to form images on X-ray detectors.
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Question 3Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 50 Mpc away would have a recession velocity of _______________ km/s. (Round your answer to the nearest 1 km/s).
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Question 4Space telescopes carrying long-wavelength infrared detectors must carry _______________ for their optics to avoid the insides of the telescope and instruments from blinding the detectors.
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Question 5_______________ galaxies have star formation, but no clear shape.
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Question 6Built in 1963, the _______________ telescope in Puerto Rico is the largest single radio dish in the world.
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Question 7A galaxy with randomly oriented elongated star orbits and little gas and dust would be a(n) _______________ galaxy.
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