Most mini-moons are “quite small, essentially the size of large boulders,” and because they reflect very little sunlight and move unpredictably, they are notoriously difficult for astronomers to detect

Grigori Fedorets, an astronomer at the University of Turku in Finland

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Most mini-moons are “quite small, essentially the size of large boulders,” and because they reflect very little sunlight and move unpredictably, they are notoriously difficult for astronomers to detect

Grigori Fedorets, an astronomer at the University of Turku in Finland