The observable universe is approximately 93 billion light-years in diameter.
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Some galaxies appear distorted due to gravitational effects.
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Some galaxies are trillions of miles wide.
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The center of the Milky Way contains a supermassive black hole.
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The Moon has no breathable atmosphere.
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The Vostok 1 mission marked the first human spaceflight.
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The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
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The Moon's gravity affects ocean tides.
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The Earth's orbit around the Sun is slightly elliptical.
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