On Mars, the sunset is blue due to how fine dust particles scatter light.
Fact #4066
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Mercury has no substantial atmosphere to trap heat.
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The light you see from some stars today began traveling before humans existed.
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The Moon has no atmosphere like Earth's.
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Black holes can bend light through gravitational lensing.
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Project Blue Book investigated reports of unidentified flying objects.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars can spin hundreds of times per second.
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In 1977, a strong narrowband radio signal known as the 'Wow! signal' was detected from space.
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