Quest to trace origin of Earth’s water is ‘a complete mess’
Space water data too simplistic and seawater may not be best comparison, new analyses suggest
![Ocean](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/08/080515_cc_water_free.jpg?fit=860%2C460&ssl=1)
BEYOND THE SEA There’s an awful lot of water in the oceans, but most of Earth’s water could be hiding deep underground and confusing the quest for how the planet got its water.
Tiago Fioreze/Wikimedia Commons (CC BY-SA 3.0)