… Even where we didn’t think it should be
When the Earth formed it could not have had water. It was simply too hot at that part of the early system. Instead water probably condensed on comets and the general consensus is that water was brought to Earth through collisions with these comets. However new research adds another dimension. The water we have now may have been around long before the solar system was even formed.
This means that come of the water molecules in your drinking glass were created more than 4.5 billion years— even older than the sun itself. In a study published Thursday in Science, researchers say the distinct chemical signature of the water on Earth and throughout the solar system could occur only if some of that water formed before the swirling disk of dust and gas gave birth to the planets, moons, comets and asteroids. This primordial water makes up 30% to 50% of the water on Earth.
This finding suggests that water, a key ingredient of life, may be common in young planetary systems across the universe. Think about that next time you turn on your facet.