Water’s origin story, science and sci-fi and more reader feedback
Water from space
A barrage of icy asteroids might have brought water to Earth. In “Water, water everywhere” (SN: 5/16/15, p. 18), Christopher Crockett described how planetary scientists are piecing together the origin story for Earth’s abundant H2O.
To figure out where Earth’s water came from, researchers looked at the ratio of hydrogen to a heavy form of hydrogen called deuterium in water samples from asteroids and comets.