Hosted on MSN

Interstellar comet 3I/ATLAS carries 40 times more heavy water than Earth’s oceans — and formed at -405 degrees

A comet born around another star is carrying water unlike anything ever measured in our solar system. Observations of interstellar comet 3I/ATLAS, published in Nature Astronomy in June 2026, reveal ...
Hosted on MSN

Interstellar comet 3I/ATLAS carries 40 times more deuterium than Earth’s oceans and formed below -405°F

When comet 3I/ATLAS swept past the Sun in late October 2025, it gave astronomers their best chance yet to taste the chemistry of another star system. What they found in its water was startling: a ...