The observable universe is about 93 billion light‑years wide.
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The Earth's orbit around the Sun is slightly elliptical.
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The sunk cost fallacy influences people to continue losing efforts.
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The Milky Way galaxy is part of the Local Group.
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The Earth orbits the Sun at about 30 kilometers per second.
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The Tardigrade can survive the vacuum of space.
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Time moves slower in stronger gravitational fields.
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The Moon has no liquid water on its surface today.
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Black holes form from collapsed massive stars.
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