The TRAPPIST-1 system contains seven Earth-sized planets, three of which are in the habitable zone.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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The Milky Way is just one of billions of galaxies in the universe.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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The Earth is not perfectly round.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Neptune is the farthest known major planet from the Sun.
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Project Blue Book investigated reports of unidentified flying objects.
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