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JWST will get a better have a look at interstellar comet 3I/ATLAS

September 29, 2025
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JWST will get a better have a look at interstellar comet 3I/ATLAS
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Infrared photos of 3I/ATLAS captured by the James Webb Area Telescope

NASA/James Webb Area Telescope

The interstellar customer 3I/ATLAS is without doubt one of the most carbon dioxide-rich comets ever seen, which can recommend it fashioned in an setting fairly not like our personal photo voltaic system.

Astronomers have been observing 3I/ATLAS since July, when it was found to be zipping by way of our photo voltaic system with excessive pace. Most observations thus far have discovered that it seems to be a reasonably common comet. Nonetheless, there have been some puzzling options hinting at an unique origin, such because it producing water fuel at distances farther from the solar than sometimes seen for comets from our photo voltaic system.

Martin Cordiner at NASA’s Goddard Area Flight Heart in Maryland and his colleagues have now obtained among the most detailed observations of the comet but utilizing the James Webb Area Telescope.

Cordiner and his staff noticed 3I/ATLAS in early August, when the comet’s distance from the solar was round 3 times the space that Earth is from the solar. At that distance, the temperature is excessive sufficient that water ought to begin turning from ice to fuel, so comets sometimes produce water-rich plumes of fuel and mud referred to as comas.

However they discovered that 3I/ATLAS’s coma comprises a particularly great amount of carbon dioxide in contrast with water, at a ratio of 8:1. That is 16 occasions increased than typical comets from our personal photo voltaic system at this distance from the solar.

The excessive ranges of carbon dioxide might recommend that the comet fashioned in a planetary system the place carbon dioxide ice was extra frequent than water ice, says Matthew Genge at Imperial School London. “That would imply there may be some basic distinction to the way in which that planetary system fashioned [compared] to ours,” says Genge.

When planetary programs first kind, there are various quantities of mud, fuel and water vapour at totally different distances from the star. Over time, the star then blows away the fuel, so solely strong materials stays. If 3I/ATLAS’s house star blew away the water vapour from the place comets had been forming sooner than occurred in our personal photo voltaic system, that might clarify its uncommon composition, says Genge.

The dearth of water vapour may be defined by the comet already having handed shut to a different star, says Genge. It is usually potential that the water could possibly be buried deeper within the comet’s crust and insulated from the upper temperatures, says Cordiner, although this may be uncommon.

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

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