The ocean floor is better mapped on Mars and the Moon than on Earth.
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The Vostok 1 mission marked the first human spaceflight.
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Mercury has no substantial atmosphere to trap heat.
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Some stars appear to dim irregularly for reasons that are still studied.
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Neptune appears blue because of methane in its atmosphere.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Rogue planets drift through space without orbiting a star.
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The light you see from some stars today began traveling before humans existed.
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The Sun makes up 99.8% of solar mass.
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