Thread: Neptune does not clear Pluto's orbit.
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Old 09-12-2018, 12:35 PM   #6 (permalink)
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Several moons are larger than the planet Pluto and two moons are larger than the planet Mercury. There also are many small moons that may be asteroids captured by their planets.

The smallest moons are seven miles in diameter, except asteroids have moons, too. In 1993, an tiny moon called Dactyl was discovered orbiting the large asteroid Ida. Dactyl is only about 1 mile wide.

Cassini discovered two moons, two miles, and two and a half miles in diameter. Is there a minimum size to classify as a moon, aside from "Large enough to be detected?"
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