One problem with a return mission to Neptune is that a flyby focused solely on that world does not provide significant bang for the buck. Without the lucky alignment available to missions in the 1970s and ’80s, we’d have to spend even more fuel to send a probe in that direction, and we wouldn’t get that much more science than we did decades ago.
The next logical step after a successful flyby mission is an orbiter, but the extreme distance to Neptune poses significant challenges. We have no clear way to haul a large enough orbiter to the Neptune system, pack enough fuel to allow it to slow down and do it all in a reasonably short amount of time.
However, researchers have shared a radical new idea for how to overcome these challenges: Use the thin atmosphere of Triton, Neptune’s largest moon, to capture a spacecraft.
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