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Nobody knows exactly.

Normally, planetary rings are made up of rocks caused by impacts between planets, moons and asteroids.

However, Neptune is not a solid planet, so there is nothing for other space objects to impact on. Also, Neptune's rings are very faint and incredibly difficult to see.

Therefore astronomers think the rings of Neptune are made of micrometre dust (dust the size of a millionth of a metre) and ice particles.

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13y ago

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