Science Rosetta Data Challenges Comet Theory, Points to Asteroids as Earth’s Main Water Source by Anika Shah - Technology April 21, 2026 by Anika Shah - Technology April 21, 2026 On World Earth Day 2026, scientists are revising theories about the origin of Earth’s water after new data from the Rosetta spacecraft challenged the long-held belief that comets delivered most … 0 FacebookTwitterPinterestEmail