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Neptune’s largest moon Triton is roughly the size of Earth’s moon. It is the coldest object in our solar system ever observed by astronomers. The Universe s1e11: The Outer Planets, History 2007
Before Voyager II ventured into the outer solar system Neptune’s moon Triton was assumed to be a geologically dead ball of rock about the size of our own moon. When Voyager beamed back photographs revealing a world with mountains, fault lines and fissures indicative of tectonic movement as well as a surprisingly thick atmosphere scientists were amazed. The Universe s2e5: Alien Moons
An irregular moon that acts just like a regular one. ibid.
It is a world in full motion, dynamic and active. Welcome to Triton. The frozen surface is alive with geysers and volcanoes. 95 Worlds and Counting, 2000
Neptune’s moon Triton. It orbits the planet in the opposite direction to most other moons in our solar system. This suggests that Triton is an orphan, captured and adopted by Neptune. An odd couple: a blue gassy giant and a frozen ice-blue moon. Voyager saw the coldest body in the solar system. Solar Empire: Edge of Darkness, Discovery 1997
Not all captured moons are small. The largest of all captured moons is Triton. It orbits the planet Neptune. And it’s big. Over 2,700 kilometres in diameter. How the Universe Works s1e8: Moons, Discovery 2010
Voyager passed a mere 3,000 miles above Neptune’s north pole, arriving with split-second accuracy … ‘The southern hemisphere of Triton is entirely covered with nitrogen ice.’ Storyville: The Farthest: Voyager’s Interstellar Journey, BBC 2018
Triton: ‘Should have been a frozen cinder. The last place we would have expected to see further dynamics, further eruptions.’ ibid.