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First ever X-ray of 3I/ATLAS reveals 400,000 km glowing ‘alien halo’

In late November 2025, astronomers captured an unprecedented cosmic signature: the first X-ray emissions ever detected from ...

From interstellar comets to alien clues: 2025’s top space discoveries

Mars. From forming black holes to phantom dark energy, discover the cosmic mysteries astronomers uncovered last year.

In 1952, DC’s skies were littered with US fighter jets chasing UFOs. More than 70 years later, the mystery persists

The night was warm and muggy over New Castle Air Force Base in Delaware, the kind of heat that clung to the metal skins of the alert fighter jets lined along the runway.

3I/ATLAS was just a comet – but could we have defended ourselves if it was aliens?

But 3I/ATLAS is no ordinary rock – it’s a comet from beyond the solar system which greeted the Earth on December 19. It’s ...