Where does this come from, and can I check it?

Triton is the only large solar system moon with a retrograde orbit. The figure is taken from ESA, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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Neptune moon Triton orbits in the opposite direction of planetary spin

Triton is the only large solar system moon with a retrograde orbit

Triton is the largest moon of Neptune and the only major moon in the solar system that orbits in a direction opposite to its planet's rotation. This retrograde orbit indicates that Triton did not form around Neptune naturally but was instead captured from the Kuiper Belt by Neptune's gravity.

Triton moon mosaic Voyager 2 (large) — NASA / Jet Propulsion Lab / U.S. Geological Survey · Public domain · source

Where this comes from

ESA

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Tags: triton, neptune, retrograde

Neptune moon Triton orbits in the opposite direction of planetary spin: the short answers

Where does this come from, and can I check it?: Triton is the only large solar system moon with a retrograde orbit. The figure is taken from ESA, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.