The parent body of asteroid Ryugu appears to have harbored water in the form of ice for over a billion years, Japanese researchers have found, in a discovery that could reshape ideas on how the Earth got its oceans. https://www.japantimes.co.jp/news/2025/09/11/japan/science-health/ryugu-asteroids-water-earth/?utm_medium=Social&utm_source=mastodon #japan #sciencehealth #hayabusa2 #space #astronomy #asteroids #planets #ryugu