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Image caption The Kuiper belt object Arrokoth is a pristine remnant of planet formation in action. Scientists say they have "decisively" overturned the prevailing theory for how planets in our Solar System formed. The established view is that material violently crashed together to form ever larger clumps until they became worlds. New results suggest the process was less catastrophic - with matter gently clumping together instead. The study appears in Science journal and has been presented at the American Association for the Advancement of Science meeting in Seattle. The study's lead researcher, Dr Alan Stern, said that the discovery was of "stupendous magnitude". Image caption The moment A... Full story

13 February