Water On Earth 'Predates' Sun And Could Signal Life On Other Planets

At least some of Earth's water is older than the solar system, even the sun itself, which could mean that other solar systems had water in the beginning, too, according to a study published Thursday in the journal Science. The research suggests the ingredients for water were around before the protoplanetary disk of condensed gas that was the early stage of our solar system gave birth to the planets around 4.6 billion years ago.