Io's volcanoes erupt sulfur compounds, giving the moon a mottled yellow, orange, and red surface.
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The Milky Way is on a slow collision course with Andromeda.
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There are rogue planets drifting through space with no star at all.
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The universe is estimated to be about 13.8 billion years old.
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Black holes can slow time so much that seconds near them equal years far away.
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The light you see from some stars today began traveling before humans existed.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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Neptune has some of the fastest winds in the solar system.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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