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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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An asteroid about the size of the Colosseum in Rome, 100 to 200 meters in length, has been detected by an international team of European astronomers using NASA's James Webb Space Telescope.