The solar system's outer edge — the Oort Cloud — extends halfway to the nearest star.
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Exoplanets have been discovered in habitable zones around distant stars.
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Neptune is the farthest known major planet from the Sun.
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Time moves slower in stronger gravitational fields.
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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 Moon's gravity influences ocean tides.
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In 1961, Yuri Gagarin became the first human in space.
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Saturn has dozens of known moons.
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