NASA's Voyager 2 is the only spacecraft to have flown past all four outer planets — Jupiter, Saturn, Uranus, and Neptune.
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Gamma-ray bursts are among the most energetic events observed in the universe.
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The Earth's rotation slightly bulges at the equator.
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Some stars collapse into black holes at the end of their life cycle.
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The observable universe is about 93 billion light‑years wide.
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Light from distant galaxies shows us the past.
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Comets are made of ice, dust, and rocky material.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Moon completes its phases in about 29.5 days.
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