The light from the most distant galaxies we see today left them before Earth even existed.
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Some stars appear to dim irregularly for reasons that are still studied.
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The Earth spins at 1000 mph.
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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 light you see from some stars today began traveling before humans existed.
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Some stars explode when they die.
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The Earth orbits the Sun once every year.
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Some pulsars emit beams of radiation like cosmic lighthouses.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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