Astronomy & Space Science · AST-241
Triton & Outer-System Moons: Foundations
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Overview
Physical identity of Triton & Outer-System Moons
Triton, Neptune's largest moon, is an icy world on a retrograde orbit that strongly suggests capture rather than formation in place. Its young-looking surface, nitrogen frost, and observed geyser-like plumes show that even very distant moons can remain geologically active.
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References & evidence
Source library for this chapter
These are the linked sources supporting the verified claims used throughout the lesson.
- 01NeptuneOpen source ↗
NASA Science
- 02Rings, Moons, and Pluto — SummaryOpen source ↗
OpenStax Astronomy 2e
View claim-by-claim traceability3 verified claims
A captured Triton would initially have occupied a more eccentric orbit, and tidal dissipation during orbital circularization could have generated substantial internal heat.
supported · checked Sep 22, 2026Triton, Neptune's largest moon, is an icy world on a retrograde orbit that strongly suggests capture rather than formation in place.
supported · checked Sep 22, 2026Voyager 2 imaged Triton's cantaloupe-like terrain, smooth plains, dark plume deposits, and a thin nitrogen atmosphere.
supported · checked Sep 22, 2026