30-50% of the water in our #SolarSytem arrived in the form of #Interstellar ice, formed even before the accreting gases ignited to become the #sun. By comparing rates of hydrogen to deuterium (H with an extra neutron), #astronomers have concluded that there is simply too much deuterium for it have all been created in our neck of the woods.
#astrodon #astronomy #space #cosmology #universeodon #science #astro
https://www.discovermagazine.com/the-sciences/earths-water-is-older-than-the-sun