They Left This Machine on the Moon — It Kept Sending Data for 5 Years

In 1977 NASA switched off five working science stations on the Moon. The instruments were still healthy, the agency's own administrator said so in writing one day before the shutdown, and the man who built them had to throw the switch himself. What that hardware recorded before it died is still rewriting what we know about the Moon, and one experiment up there was never possible to switch off at all.

For the shutdown decision I went to the primary document rather than the retellings: Robert Frosch's letter to the White House Office of Science and Technology Policy, dated 29 September 1977. The line that carries this video is his, verbatim.

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SOURCES & FURTHER READING
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"ALSEP Termination Report: eight years of continuous operation", NASA RP-1036, 1979
https://ntrs.nasa.gov/citations/19790014808

"153,000 commands and one trillion bits: the full ALSEP record", Lindsay, NASA History
https://www.nasa.gov/wp-content/uploads/static/history/alsj/HamishALSEP.html

"Why a dead world keeps ringing after an impact", Latham et al, 1970, Science
https://www.science.org/doi/10.1126/science.167.3918.455

"The man who deactivated the lunar network", Hond, Columbia Magazine, 2019
https://magazine.columbia.edu/article/columbia-goes-moon

"440 lost tapes and the ground that kept warming", Nagihara et al, 2018, JGR Planets
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JE005579

"Twenty two thousand unidentified events in ignored Apollo data", Onodera et al, 2024, JGR Planets
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2023JE008153

"A contracting Moon and the south polar landing zones", Watters et al, NASA
https://www.nasa.gov/solar-system/moon/shrinking-moon-causing-moonquakes-and-faults-near-lunar-south-pole/

"Why the Apollo mirrors return less light every decade", Sabhlok, Battat & Murphy, 2024, Icarus
https://arxiv.org/abs/2403.00899

"Fifty years of ranging to the lunar arrays", Murphy, UC San Diego APOLLO
https://tmurphy.physics.ucsd.edu/apollo/

Image: NASA / Apollo Lunar Surface Journal / NASA LRO / DOE

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