The Oort Cloud is a theoretical shell of icy objects surrounding 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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The Moon has lower gravity than Earth.
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The Apollo 11 mission successfully landed humans on the Moon.
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The heliosphere protects the solar system from interstellar radiation.
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The telescope expanded understanding of the universe.
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The observable universe is about 93 billion light‑years wide.
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The Moon has no atmosphere like Earth's.
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The Rosetta mission successfully landed a probe on a comet in 2014.
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