If the Sun were the size of a typical front door, Earth would be about the size of a nickel.
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Some stars appear to dim irregularly for reasons that are still studied.
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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 event horizon marks the boundary around a black hole.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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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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Some stars explode when they die.
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The James Webb Space Telescope observes distant galaxies in infrared light.
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The observable universe is about 93 billion light‑years wide.
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