3I/ATLAS Update: NASA Image Confirms Anti-Tail, Why A Sunward Tail Should Not Exist

Hubble captured this image of the interstellar comet 3I/ATLAS on July 21, 2025, when the comet was 277 million miles from Earth. Hubble shows that the comet has a teardrop-shaped cocoon of dust coming off its solid, icy nucleus. (Credit: NASA, ESA, David Jewitt UCLA/NASA)

It is a basic, beautiful rule of the cosmos: when a comet, a dusty ball of ice, swings close to the Sun, its frozen heart begins to boil. The resulting plume of gas and dust is whipped violently backwards by the solar wind, creating a magnificent, curving tail that points away from our star. It is a predictable, natural, and messy process.

But the interstellar object 3I/ATLAS is proving to be neither natural nor messy. It is a mystery that is far too neat.