The Voyager probes have traveled beyond the heliosphere.
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Some stars appear to dim irregularly for reasons that are still studied.
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The Earth's gravity keeps the Moon in orbit.
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The Milky Way is estimated to be over 100,000 light-years wide.
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Some stars explode when they die.
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The Earth spins at 1000 mph.
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The Moon was likely formed after a massive collision with early Earth.
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The Moon completes its phases in about 29.5 days.
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The Sun occasionally emits powerful solar flares.
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