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About 66 million years ago, a massive ____ hit Earth.
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asteroid
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Everything in the Milky Way orbits around a supermassive ____.
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black hole
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A ____ entering the Earth's atmosphere looks like a shooting star.
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comet
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A ____ is an extremely bright stellar explosion.
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meteor
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As a ____ orbits the Sun, its tail is blown away from the Sun.
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nebula
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Sirius is the brightest ____ seen in the Earth's night sky.
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satellite
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A ____ is an interstellar cloud of dust and gas.
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star
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The Moon is a ____ that orbits the Earth every 27.3 days.
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supernova
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