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What produces the striking red,blue,and black colors of ionization nebulae?
Q6: Which of the following statements about ozone
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Q33: Starburst galaxies produce most of their light
Q39: Which of the following is the most
Q42: The vast majority of stars in a
Q49: What kind of star is most likely
Q81: One possible explanation for a galaxy's type
Q83: Suppose a future telescope is able to
Q83: Observations show that elements with atomic mass
Q95: Brown dwarfs,white dwarfs,and neutrons stars are all