Interstellar comet 3I/ATLAS carries water with a deuterium-to-hydrogen ratio at least 40 times higher than that of Earth’s ...

Somewhere in the galaxy, in a place colder than anything our solar system has ever produced, a ball of ice took shape.

The SETI Institute is the latest to confirm what scientists have long suspected: the interstellar 3I/ATLAS comet is not an ...

What could be the brightest comet of the year is set to pass by Earth this week. The comet, formally known as C/2025 R3 (PanSTARRS), was discovered only in September 2025 by Pan-STARRS telescopes in ...

This image, provided by NASA, shows the interstellar comet 3I/Atlas captured by the Hubble Space Telescope on Nov. 30, 2025, about 178 million miles (286 million kilometers) from Earth. (NASA, ESA, ...

An incoming comet is already making waves as potentially the brightest of its kind that could be visible from Earth in 2026. The comet, formally known as C/2025 R3 (PanSTARRS,) has been brightening in ...

(CNN) — Two newly discovered comets are streaking across the sky in a spectacular display as they make their closest approaches to Earth this month. Comets are made of ice, frozen gases and rock, and ...

The most visible comet of the fall will make its closest approach to Earth overnight. Comet Lemmon (C/2025 A4) is one of a pair of comets sweeping through the solar system. The other is SWAN (C/2025 ...

Australians will have their only chance to spy a newly discovered blue-green comet scorching past Earth during the next fortnight – coinciding with the flashy peak of a meteor shower – before the ...