A star 1,300 light-years from Earth might have just revealed one of the Solar System's best-kept secrets.
that helps particles cling together in the very first stages of planetary growth.
We can gauge where and how water forms based on isotopes of hydrogen. Normal hydrogen has no neutrons in its nucleus. Heavy hydrogen, also known as deuterium, has one neutron in its nucleus. Water molecules that include heavy hydrogen is known as heavy water, and it forms under conditions that differ from those that make normal water.
"We can think of the path of water through the Universe as a trail. We know what the endpoints look like, which are water on planets and in comets, but we wanted to trace that trail back to the origins of water,""Before now, we could link the Earth to comets, and protostars to the interstellar medium, but we couldn't link protostars to comets.
What makes V883 Orionis so special is that it's been undergoing a burst of accelerated growth, which means it's temporarily hotter than usual. Most water in the accretion disks around protostars is frozen, existing as vapor only close to the star, where it's hard to make out. V883 Orionis's activity burst, however, hasto a point much farther from the star than usual; any water closer than that snowline is vapor.
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