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A COLLISION IN THE ASTEROID BELT: Something violent just happened in the asteroid belt. Not far beyond the orbit of Mars, asteroid 6478 Gault appears to have been struck by another asteroid. The resulting stream of debris stretches more than 400,000 km, which is greater than the distance between Earth and the Moon. Astronomers around the world are now monitoring the formerly unremarkable asteroid to see what happens next. Get the full story on today's edition of Spaceweather.com.