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Q6: Ordinary matter makes up approximately _percent of
Q14: _ are fossilized remains of colonies of
Q17: Seyfert galaxies are_<br>A) spiral galaxies with unusually
Q19: A unique property of water is that
Q22: Due to the temperature and atmospheric conditions
Q38: What kind of asteroid crosses into Mars'
Q54: What observed feature of the Milky Way
Q61: Gas and dust released by a comet's
Q62: Spiral galaxies are mostly found _.<br>A) in
Q67: Stars in the central bulge of the