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James Webb telescope detects the "smallest" asteroid in history

The object observed is probably the smallest observed to date by Webb and may be an example of an object measuring less than 1 kilometer in length within the main asteroid belt, located between Mars and Jupiter.

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According to a report published on the agency's website, the project used data from the Mid-Infrared Instrument (MIRI) calibration, in which the team happened to detect this interloper asteroid.