Ganymede, a moon of Jupiter, is the largest moon in the solar system and is even bigger than the planet Mercury.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Comets are made of ice, dust, and rocky material.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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The Hubble Space Telescope revolutionized deep-space imaging.
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Supernovae can briefly outshine entire galaxies.
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Neutron stars are among the densest objects in the universe.
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The light you see from some stars today began traveling before humans existed.
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