The observable universe contains an estimated two trillion galaxies.
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Cosmic rays constantly bombard Earth from space.
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The Milky Way contains regions of active star formation.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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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 Earth spins at 1000 mph.
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Fast radio bursts are powerful millisecond-long radio pulses from distant galaxies.
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There are rogue planets drifting through space with no star at all.
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The Moon always shows the same face to Earth.
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