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James Webb Space Telescope takes 1st look at interstellar comet 3I/ATLAS with unexpected results
NASA's $10 billion space telescope studied the third interstellar object to enter the solar system, measuring the chemical contents of its halo.
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The James Webb Space Telescope (JWST) has observed the interstellar visitor 3I/ATLAS for the first time. The powerful space telescope trained its infrared vision and its Near-Infrared Spectrograph instrument (NIRspec) on the comet on Aug. 6, 2025.
Discovered on July 1 by the ATLAS (Asteroid Terrestrial-impact Last Alert System) survey telescope, 3I/ATLAS is just the third-ever object found drifting through our solar system that is believed to have originated from around another star. The other two interstellar intruders were 1I/'Oumuamua, discovered in 2017, and 2I/Borisov, detected in 2019.
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Is it a comet, or an alien spacecraft? Here's what one Harvard scientist says
NASA is tracking a mysterious, fast-moving object entering our solar system, raising questions about whether it's just a comet — or possibly something more advanced.
The object, known as 3I-ATLAS, was discovered on July 1 by a telescope in Chile. It's the third interstellar object ever recorded entering our solar system, and is hurtling toward the sun at about 130,000 miles per hour, making it the fastest of its kind ever detected.
Scientists estimate its size could range from the length of Boston’s Ted Williams Tunnel, or 1.6 miles, to as long as Manhattan's diameter, about 14 miles across.
"From images, we also saw that this object is active, which means that around the nucleus, there is some coma, which is an indication that this object is, in fact, a comet," explained NASA navigation engineer Davide Farnocchia.
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