Floating or flying "rovers" will also count, such as would potentially be useful on Venus or Jupiter.
In order to qualify as a "rover", it must be capable of moving arbitrary distances and have a long-term power source such as solar panels or an RTEG. A short term battery-powered craft doesn't count, nor does a stationary lander.
@OnixarLilen Presumably from the way the question is asked, a rover on another moon wouldn't count. Which is a bit sad because we're probably sending a quadcopter to Titan in 2027 which is cool enough to count if it were up to me :D
@RobertCousineau I think I explained it in the description already? Must have a long-term power source.
@IsaacKing in your description you currently have an "and" conditional and say it must be able to travel "arbitrary distance". While I definitely think I get your intent with that, "arbitrary distance" and "run indefinitely" both mean this market is unlikely to resolve true (if taken literally) in any foreseeable future.
@RobertCousineau Does "designed to be operation for at least 6 months" seem reasonable?
@RobertCousineau Hmm, well if it successfully roves for 5 months and then breaks down, I feel like that should still count?
@JoshuaWilkes Ah, good point. What about "It must not have a built in hard limit on its operating lifespan", like a battery would provide?
@IsaacKing that would technically preclude the Curiosity and Perseverance rovers, since their RTGs will run out eventually.
@JoshuaWilkes I think if this were my market I just wouldn't specify that it needs to be a long-term rover, but I think you've already crossed that bridge.
@JoshuaWilkes Nah, too short term. I've clarified that rovers must be designed to operate indefinitely.
Here's a manalink to make up for your bet in case you had made it thinking Vega would count, and as a thank-you for pointing that out. https://manifold.markets/link/rFKzV5sJ
@IsaacKing You're alright. I factored the risk you'd say it wouldn't count into my bet. I hope we get a solar powered Venus aircraft!
There's also the land sailing rover, which NASA seem quite serious about supporting in development