New analysis of ALMA observations of interstellar comet 3I/ATLAS show its water carries a chemical signature pointing to a colder, more distant origin than any comet ever measured.

Recently discovered interstellar comet 3I/ATLAS have been captured using the European Southern Observatory's Very Large ...

A mysterious comet from beyond our solar system is giving astronomers a rare glimpse into alien worlds — and it may have ...

Discovered in 2017 by Pan-STARRS atop Halealakalā on Maui, ʻOumuamua was the first confirmed interstellar visitor. Its ...

A comet from another star system is carrying water unlike anything astronomers have ever measured in our cosmic neighborhood.

The Subaru Telescope achieved first light in January 1999 and entered its 27th year of operation in 2026. In March 2025, ...

While the world debated elections, artificial intelligence, and coffee prices for the majority of last winter, a tiny object ...

ALMA reveals unusual “alien” water in interstellar comet 3I/ATLAS, showing it formed in an extremely cold, distant star ...

This artist’s impression compares the semi-heavy water content of the interstellar comet 3I/ATLAS (left) and Earth (right).

The comet that rambled past us from another star last year likely originated in a cold, isolated corner of the galaxy that ...

The presence of deuterium, an isotope of hydrogen, in 3I/ATLAS suggests the interstellar comet formed in a much colder place ...

An interstellar comet carries water unlike anything in our solar system, revealing a far colder birthplace and clues about ...