Dark energy is thought to drive the accelerating expansion of the universe.
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Exoplanets have been discovered in habitable zones around distant stars.
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Saturn's rings are made primarily of ice particles and rocky debris.
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In 1859, the Carrington Event caused powerful solar storms that disrupted telegraph systems.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Cosmic rays constantly bombard Earth from space.
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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 observable universe is about 93 billion light‑years wide.
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Time moves slower in stronger gravitational fields.
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