An asteroid roughly the size of Rome�??s Colosseum �?? between 300 to 650 feet (100 to 200 meters) in length �?? has been detected by an international team of European astronomers using NASA's James Webb Space Telescope. The object, shown in this artist�??s conception, is likely the smallest observed to date by Webb.

The detection was serendipitous �?? the asteroid was found in calibration images of a different asteroid. The lucky finding suggests Webb can detect many such objects.