The first exoplanet orbiting a sun-like star was confirmed in 1995; we've since discovered over 5,000 confirmed exoplanets.
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The observable universe is about 93 billion light‑years wide.
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The Earth's atmosphere gradually fades into space.
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Project Blue Book investigated reports of unidentified flying objects.
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The observable universe is about 93 billion light‑years wide.
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There are rogue planets drifting through space with no star at all.
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Comets are made of ice, dust, and rocky material.
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The Moon has lower gravity than Earth.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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