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What was the defunct spacecraft? ...'cos it's been – what, 15 years now, at least, that astronomers ID'ed the Apollo 10 S-IVB by its radar signature, surface albedo, spectrographic data...? Isn't the Apollo 10 LM ascent stage still supposed to be out there...? Heliocentric?

Defunct spacecraft gave me a pause for thought. Given we know where all of our funct and pretty much all of our defunct spacecraft are then does this mean a defunct spacecraft not from Earth. What if it's not defunct!?

Resolve parent-child relationship between a cross species couple on a spaceship that on it's mission to stop a extra-galactic planet eating Von Neumann probe.