The Milky Way's black hole, Sagittarius A*, flares in X-rays several times daily.
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The Milky Way galaxy is part of the Local Group.
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The Sun occasionally emits powerful solar flares.
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A day on Mars is slightly longer than a day on Earth.
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Solar eclipses occur when the Moon blocks the Sun from Earth's view.
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The Moon completes its phases in about 29.5 days.
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The observable universe is about 93 billion light‑years wide.
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Dark energy is thought to drive the accelerating expansion of the universe.
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Neutron stars are among the densest objects in the universe.
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