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The Asteroid That Thought It Was a Comet

The difference between an asteroid and a comet was always thought fixed—but now a new paper says the two celestial bodies may be more similar than we thought

Spotted: A Shooting Gallery for Comets

Astronomy is an imprecise business, and much of what skywatchers see depends on what tool they're using to look. In 1610, Galileo became the first person to spot...

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