X-Ray Glow Around 3I/ATLAS Is Too Bright: Is The 250,000-Mile Cloud An Error?

This illustration shows the Sentinel-6 Michael Freilich spacecraft in orbit above Earth with its deployable solar panels extended. (Credit: NASA.gov/Elyna Niles-Carnes)

For those of us who think we have a handle on the universe, a new discovery has just thrown the celestial rulebook out the window. Interstellar comet 3I/ATLAS, a space traveller from beyond our solar system, is currently baffling scientists with a never-before-seen feature: a colossal, faint X-ray cloud that stretches out an astonishing 250,000 miles around its nucleus. To put that into perspective, that's further than the average distance from the Earth to the Moon.

The findings have been quickly labelled 'puzzling' by the scientific community, and for a good reason. While X-ray emission has been observed in our own solar system's comets since the days of Comet Hyakutake in 1996, this is the first confirmed detection from an object that didn't form around our Sun.