While NASA's James Webb Telescope and other instruments have already spotted abundant water vapor, carbon monoxide and carbon dioxide in 3I/ATLAS's coma, X-ray observations are uniquely sensitive to lighter gases such as hydrogen and nitrogen that are otherwise hard to detect.

Comet 3I/ATLAS makes closest approach to Earth, 170 million miles away, offering rare insights into interstellar space and cometary formation.

London, UK - 18 Dec, 2025 - A little over two thousand years ago, an unusual star was seen in the skies above Jerusalem, marking the birth of a significant prophetic era. Now, this same star has returned,

In the spirit of the season, the interstellar comet 3I/ATLAS is changing color as it leaves the sun behind — shifting from a reddish tint to a faint green glow. That visible change signals the comet is reacting to solar heat and releasing new gases in space, giving scientists fresh clues about what it is made of and how it behaves.