Did the Earth form with water locked into its rocks, which then gradually leaked out over millions of years? Or did the occasional impacting comet provide Earth’s oceans? The Ptolemy experiment on Rosetta may just find out…

The Earth needed a supply of water for its oceans, and the comets are large celestial icebergs - frozen reservoirs of water orbiting the Sun.
Did the impact of a number of comets, thousands of millions of years ago, provide the Earth with its supply of water? Finding hard scientific evidence is surprisingly difficult.

Ptolemy may just provide the information to understand the source of water on Earth. It is a miniature laboratory designed to analyse the precise types of atoms that make up familiar molecules like water.

The rest of the story can be find here.

thanks Thierry

hydrogen chemical reacts to create helium and further down the line, happens on the sun all the time. It will become a more helium ball than hydrogen.
This solar system is built from previous matter that collected together.
Different matter "floated" in different areas and gravitated into the planets/sun.
Hhhydrogen - Helium - to eventually oxygen. But it took some kind of chemical reaction to get that water created.
Did that water already exist somehow in the solar system's creation or before?
Or is water actually dynamic, constantly created/destroyed... since we know
we can separate Hydrogen/oxygen from water, we use this for rocket fuel and energy for spacecraft, as fuel cells on the spacecraft take hydrogen and oxygen to create electricity and the result is water, drinkable...

funny how the planet is covered with liquid water, and its basically hydrogen and oxygen.