[X] My Assistant

[Phil Stooke]

Of course, a mechanical or electronic failure is likely to end the mission long before the RTG wears out (same as on Curiosity)

Phil

[yaohua2000]

Chang'e 5 atmospheric re-entry and parachute ejection system tested.

Attached thumbnail(s)

 

[dvandorn]

Okay, kewl. A rather less robust geological exploration in re the sample return, then. As with the Soviet Luna sample return spacecraft, your selection of samples is limited to the variety available within reach of an arm attached to the lander. Certainly, this is more robust than, say, the seminal APXS systems flown on Surveyor, which had a variety of targets limited to an area less than a square foot (and that only when improvised operations using Surveyor's digging scoop arm to push the APXS sensor away from the ground directly below its deployment housing -- without that improvisation, Surveyor would have a target selection pre-determined by the single spot over which the APXS sensor was located after landing).

It *is* nice that the Chang'e return scheme, as per the illustration, will be a deep core. Such was returned by the final Luna sample return craft, as well (though perhaps not as deep as the Apollo deep cores). But we're not looking at the kind of exploration flexibility and variety, in terms of returned samples, that you could get by roving around and selecting the most interesting samples (both those that represent the common rocks and soils that define the overall area geologically plus the unique and exotic samples that represent rocks thrown into the area from other geological units far away). Yes, you would need to acquire very small samples of each type of rock you find, but that's the same challenge MSR will be facing in the next couple of decades.

I guess the good news is that China is developing an infrastructure for unmanned lunar exploration that can be exploited in a number of ways in the future. Perhaps after the deep-core sample return process has been proven out, we will see the LSR-style rover-cache-plus-separate-return-vehicle architecture developed to provide a truly robust geological exploration capability. At least, one can hope...

-the other Doug (With my shield, not yet upon it)