There are an estimated 2 trillion galaxies in the observable universe.
Fact #6544
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Black holes can slow time so much that seconds near them equal years far away.
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There are rogue planets drifting through space with no star at all.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Black holes can slow time so much that seconds near them equal years far away.
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In 1977, a mysterious signal known as the 'Wow! signal' was detected from space.
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The International Space Station travels at about 28,000 kilometers per hour.
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A sea star can regrow lost arms.
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The light you see from some stars today began traveling before humans existed.
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