NASA researchers have proposed a 2025 mission to Neptune’s mysterious moon Triton, which may host an ocean of liquid water beneath its icy crust.

With a largely unmapped surface, a mysteriously charged upper atmosphere and a rare rotation counter to that of its host planet, Triton offers much to investigate.

The so-called Trident mission — named after Neptune’s spear in Roman mythology — is one of four proposals competing to be realised under NASA’s ‘Discovery Program’.

Two of the concepts — which also feature studies of Jupiter’s moon Io and Venus — will be selected next summer and launched within this decade. 

NASA researchers have proposed a 2025 mission to Neptune's mysterious moon Triton, pictured, which may host an ocean of liquid water beneath its icy crust

NASA researchers have proposed a 2025 mission to Neptune's mysterious moon Triton, pictured, which may host an ocean of liquid water beneath its icy crust

NASA researchers have proposed a 2025 mission to Neptune’s mysterious moon Triton, pictured, kogama games which may host an ocean of liquid water beneath its icy crust

<div class="art-ins mol-factbox floatRHS sciencetech" data-version="2" id="mol-487ce660-b480-11ea-9db3-c3a5d8109b59" website proposes mission to Neptune&apos;s moon Triton which may harbour ocean