The Voyager probes have traveled beyond the heliosphere.
Fact #1028
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The observable universe spans billions of light-years.
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The expansion of the universe was first observed in the 1920s.
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Quasars are extremely bright objects powered by supermassive black holes.
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The light you see from some stars today began traveling before humans existed.
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The Hubble Space Telescope revolutionized deep-space imaging.
Fact #1029 · Space
The observable universe is about 93 billion light‑years wide.
Fact #1750 · Space
The Milky Way galaxy is part of the Local Group.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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