SCIENCE
Why Is Comet 3I/ATLAS Acting So Strange?
MarsThu Nov 20 2025
Comet 3I/ATLAS just flew by Mars, and NASA shared some cool images taken by the MAVEN spacecraft. The pictures show the hydrogen cloud around the comet, but there's more to the story than what NASA said.
The hydrogen cloud around 3I/ATLAS isn't acting like a typical comet. It's not spread out evenly. Instead, it's more stretched out on one side, with a clear direction. This isn't what scientists usually see in comets. Normally, hydrogen from a comet spreads out in all directions as water ice turns into gas. But 3I/ATLAS seems to be shooting hydrogen out in a specific way, like a jet.
There's another weird thing. Where the comet's hydrogen meets the hydrogen in space, there's a dark band. It's like a shadow or a gap. This could mean that the hydrogen isn't coming out evenly from the comet. Maybe it's coming out in jets or from hot spots on the comet's surface.
On the side of the image where Mars' hydrogen is bright, the comet's hydrogen stays strong and doesn't get washed out. This is unusual because usually, a comet's hydrogen would get lost in the bright hydrogen from a planet. But 3I/ATLAS holds its own, which suggests its hydrogen is extra dense or stuck together in some way.
All these strange features make scientists wonder if 3I/ATLAS is following the usual rules of comets. Maybe it has unusual chemistry or physics that we don't understand yet. As more images come in, we might learn if this comet is truly one of a kind.
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questions
Could the structured gradient and velocity-shear in 3I/ATLAS's hydrogen cloud be indicative of an extraterrestrial origin?
Could 3I/ATLAS's hydrogen cloud be the cosmic equivalent of a bad hair day?
What are the potential biases or limitations in the analysis techniques used to identify the anomalies in the MAVEN image?
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