There are planets without stars.
Fact #2357
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The Moon has no breathable atmosphere.
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The Sun accounts for more than 99% of the mass of our solar system.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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Exoplanets have been discovered in habitable zones around distant stars.
Fact #1625 · Space
The Hubble Space Telescope revolutionized deep-space imaging.
Fact #1029 · Space
Some stars appear to dim irregularly for reasons that are still studied.
Fact #1599 · Space
The Yellowstone supervolcano is one of the largest volcanic systems in the world.
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Project Mercury was the first U.S. human spaceflight program.
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