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Vast constellations of human-made objects in the sky could increase light pollution, interfere with radio signals, and contribute to the growing issue of space debris.
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Elusive intermediate-mass black holes may hold clues to how their more common supermassive cousins form.
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Vast constellations of man-made objects in the sky could increase light pollution, interfere with radio signals, and contribute to the growing issue of space debris.
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Mercury and Mars appear closer to each other in the evening sky than they have in more than a decade, while the Moon slides past both Jupiter and Saturn.
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As dark matter experiments continue to come up empty, scientists are refocusing their hunts on smaller projects and smaller potential particles.
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Spitzer has studied the infrared sky since 2003. Now NASA says it will retire the flagship "Great Observatory" in 2020.
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The recently discovered dwarf galaxy Antlia 2 may be the cause of strange ripples in the Milky Way’s outer disk.
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Cassini's final dive through Saturn's rings gave us a wealth of details about small structures that reveal big facts about how the rings formed and evolve.
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A wrecking ball of dark matter 5 million times the mass of the Sun may be the best explanation for a disrupted stream of stars.
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Astronomers have found table salt on Europa’s surface, a clue to the chemistry of the moon’s underground ocean — including its potential for hosting life.
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