Mercury has water ice in permanently shadowed craters despite being the closest planet to the Sun.
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The Moon was formed billions of years ago.
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The Sun accounts for more than 99% of the mass of our solar system.
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Venus has the longest day of any planet in the solar system.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Solar flares originate from the Sun's surface.
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The Earth orbits the Sun once every year.
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The observable universe is about 93 billion light‑years wide.
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Black holes can slow time so much that seconds near them equal years far away.
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