Long before 3I/ATLAS slipped through the inner solar system, its water had already recorded the kind of place it came from.

A comet born around another star is carrying water unlike anything ever measured in our solar system. Observations of ...

The astronomer used the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to make the observations.

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 ...

Deuterium is the heavy twin brother of hydrogen; however, it is more than 20 times rarer than identical twins. It accounts for only 0.015 percent of natural hydrogen and is twice as heavy as the light ...

Nuclear fusion usually brings to mind sprawling facilities, blistering temperatures, and machines built on a scale that can swallow budgets whole. This device does something stranger.

To find advanced civilizations, you don’t need to go hunting for megastructures or hypothetical space probes. You could find civilizations just a few centuries ahead of us by looking for a key element ...

A new study appears to solve a 35-year-old puzzle among astronomers about the distribution of an isotope forged just after the Big Bang, but it poses new questions about the ways in which stars form ...