New research published in Nature suggests that Earth had water at a very early stage.
Mario Fisher-Gödde and Thorsten Kleine at the University of Münster, Germany examined meteorites that fell in British Columbia in January 2000.
They found that the ruthenium isotopes in them did not match those found in the Earth’s mantle. This suggests that meteorites are not the earliest source of our planets water, which had to be present at the very beginning.