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A tiny Apollo 17 moon rock is unlocking a secret lunar historical past

September 26, 2025
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A tiny Apollo 17 moon rock is unlocking a secret lunar historical past
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An unassuming rock collected from the floor of the moon over 50 years in the past by the Apollo 17 astronauts Gene Cernan and Harrison Schmitt might utterly alter what we thought we knew concerning the early days of the moon and, by extension, the photo voltaic system.

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The rock pattern, catalogued merely as 76535, has a chemistry and texture that signifies it shaped deep down within the moon‘s crust, practically 31 miles ( 50 kilometers) underground. Furthermore, radioisotope relationship locations it as having been on the lunar floor for 4.25 billion years.

Liberating rocks so deep takes probably the most huge of impacts. The idea had been that the impression that gouged out the South Pole–Aitken Basin, which is the biggest impression website on the moon, had dug out rock 76535, particularly since their ages approximately match.


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However, new simulations show that rock 76535 probably formed beneath the ground where it was found at Apollo 17‘s landing site in the Taurus–Littrow Valley on the eastern flank of Mare Serenitatis (Sea of Serenity).

There has always been an air of doubt over the claim that the South Pole–Aitken basin was the point of origin for rock 76535. After all, the rock displays no evidence for a violent past, yet the South Pole–Aitken basin and Mare Serenitatis are practically on opposing sides of the moon. It seems inconceivable that a rock could be gouged out of the ground and sent from the southern far-side to the northern near-side without the rock displaying evidence of shock heating, scarring and other symptoms of having a giant asteroid crash on its head, ferociously excavate it from the ground and fling it into a different hemisphere.

Now, detailed computer simulations of giant impacts on the moon, led by Evan Bjonnes of the Lawrence Livermore National Laboratory in California, show exactly how rock 76535 could have literally arisen in Mare Serenitatis.

“We sought a simpler, local explanation,” said Bjonnes in a statement. “And the fashions stored exhibiting the identical factor — huge impacts can raise deep rocks to the floor with out over-shocking them.”

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The simulations point out that through the latter levels of an impression just like the one which shaped Mare Serenitatis, a newly shaped crater flooring can endure collapse because the super-heated crust permits materials to movement extra freely. Within the simulations, as the ground collapses, to make room for it as much as 33,588 cubic miles (140,000 cubic kilometers) of fabric might be pushed as much as the floor extra gently than if it have been merely gouged out. This is able to clarify the shortage of scarring or shock-heating on rock 76535 — it had merely risen to the floor by way of the liquified crust within the instant aftermath of the impression that shaped Mare Serenitatis.

That is a neat discovery, however the repercussions might span the photo voltaic system. As Bjonnes places it: “This rock could also be small, nevertheless it carries an enormous story concerning the moon’s early historical past.”

If rock 76535 was excavated 4.25 billion years in the past, that signifies that Mare Serenitatis should have shaped 4.25 billion years in the past — however that’s 300 million years sooner than what lunar geologists had thought based mostly on different strains of proof corresponding to crater counts.


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If the Mare Serenitatis basin is older, then maybe different lunar impression basins are additionally older than we had calculated. As a result of the airless floor of the moon is commonly used to calibrate impression charges within the early photo voltaic system — as a result of related impacts on Venus, Earth and even Mars have weathered away — any change within the timeline of impression occasions on the moon will have an effect on the timeline in the remainder of the photo voltaic system too.

“By pushing Serenitatis again in time, we’re shifting the complete timeline of when huge impacts occurred throughout the photo voltaic system,” stated Bjonnes. “That has a ripple impact for understanding Earth’s early atmosphere too.”

With astronauts quickly to be heading again to the moon there is a perfect alternative to show these findings, for the reason that identical processes should have occurred to different lunar maria, and so they too might need rocks on the floor like 76535 that astronauts might convey again to Earth for extra detailed investigation.

The findings have been revealed on Sept. 18 within the journal Geophysical Research Letters.



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