Io, one of Jupiter's moons, is the most volcanically active body in the solar system.
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Project Mercury was the first U.S. human spaceflight program.
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The heliosphere protects the solar system from interstellar radiation.
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The Sun occasionally emits powerful solar flares.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The Fermi Paradox questions why extraterrestrial life has not been observed.
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The observable universe is about 93 billion light‑years wide.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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The Milky Way and Andromeda galaxies are on a slow collision course.
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