A family of comets reopens the debate about the origin of Earth's water

Where did the Earth’s water come from? Although comets, with their icy nuclei, seem like ideal candidates, analyses have so far shown that their water differs from that in our oceans. Now, however, an international team, including CNRS researchers, has found that one family of comets, the hyperactive comets, contains water similar to terrestrial water. The study relies in particular on measurements of comet 46P/Wirtanen carried out by SOFIA, NASA’s Stratospheric Observatory for Infrared Astronomy.
Source: EurekaAlert, https://www.eurekalert.org