The Rosetta spacecraft became the first to orbit a comet and land a probe on its surface in 2014.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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Project Mercury was the first U.S. human spaceflight program.
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Venus has surface temperatures hot enough to melt lead.
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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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Dark energy is thought to drive the accelerating expansion of the universe.
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The light you see from some stars today began traveling before humans existed.
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There are rogue planets drifting through space with no star at all.
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