The Viking landers in 1976 were the first spacecraft to successfully operate on Mars's surface.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The light you see from some stars today began traveling before humans existed.
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The Vostok 1 mission marked the first human spaceflight.
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There are stars older than the Milky Way.
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The observable universe spans billions of light-years.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Some metals such as mercury are liquid at room temperature.
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Time moves slower in stronger gravitational fields.
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