
The water in your coffee this morning is older than the Sun, formed in interstellar clouds before the solar system existed, and roughly half of every glass of water on Earth predates the planet it’s sitting on by about a billion years.
Roughly half the water on Earth formed in interstellar clouds before the Sun existed. A new study of comet 3I/ATLAS, the third interstellar visitor ever detected, has now measured water from another planetary system for the first time, finding deuterium levels 30 times higher than any solar system comet.














