Mars has two moons — Phobos and Deimos — which are likely captured asteroids.
Fact #3864
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Venus is sometimes called Earth's sister planet.
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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 Moon always shows the same face to Earth.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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The Moon has no breathable atmosphere.
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The Earth's atmosphere gradually thins into outer space.
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The Voyager probes have traveled beyond the heliosphere.
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The observable universe is about 93 billion light‑years wide.
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