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New research of Apollo 16 moon samples reveals hidden lunar historical past

October 28, 2024
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New research of Apollo 16 moon samples reveals hidden lunar historical past
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Scientists proceed to piece collectively the moon’s complicated historical past utilizing lunar samples collected throughout NASA’s Apollo missions over half a century in the past. 

A recent evaluation of lunar mud collected by Apollo 16 astronauts in 1972 affords a clearer image of the consequences of asteroid strikes on the moon, permitting scientists to reconstruct billions of years of lunar historical past. The findings might additionally assist upcoming crewed missions pinpoint treasured pure sources for establishing moon bases, scientists say.

After touchdown within the heavily-cratered Descartes area within the lunar highlands, astronauts John Younger, Charles Duke and Ken Mattingly collected roughly 200 kilos (96 kg) of fabric from the moon’s floor. Chemical analyses of soil-like pebbles in these samples, which the astronauts had gathered by raking throughout the touchdown website, have revealed the presence of varied noble gasses together with argon and xenon. These trapped gasses function helpful timestamps of area climate processes like photo voltaic wind and asteroid impacts which have helped form and reshape the moon’s floor over billions of years.

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Many of the samples collected throughout the Apollo period have already been scrutinized. To benefit from new science and know-how, NASA cracked open one of many final sealed samples, collected throughout the Apollo 17 mission, simply two years in the past. A lot of our information concerning the moon and its evolution comes from these samples, together with the moon’s true age being 40 million years older than we thought.

However researchers say this new research of trapped lunar gasses is already revealing new chapters of lunar historical past.

“We will construct a way more full image of the historical past of this a part of the moon throughout the early photo voltaic system, the place heavier impacts on the lunar floor in its first billion years or so gave method to much less intense durations from two billion years in the past or so,” research lead creator Mark Nottingham of the College of Glasgow within the U.Ok. stated in a latest statement.

Whereas analyzing samples collected throughout the Apollo 16 mission, Nottingham and his colleagues used mass spectrometry strategies to catalog varied noble gasses and their abundance within the samples, which helped them “decide how a lot time the samples spent uncovered on or close to the moon’s floor,” Nottingham stated within the assertion.

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Chemical make-up of gasses trapped in these “regolith breccias” — a results of moon mud fusing into rock beneath the sheer power of asteroid impacts — present they stood uncovered to photo voltaic wind and asteroid impacts for a chronic interval. 

The precise publicity ages diversified broadly between samples, from 2.5 billion years in the past to lower than a billion, suggesting the moon’s soil across the touchdown space is “nicely blended,” with a few of it dredged as much as the floor by newer impacts, the brand new research stories. 

Nottingham says that research like this one will assist scientists higher perceive the place noble gases and different components is perhaps discovered on the moon and in what abundance, serving to humanity higher plan for future lunar exploration.

“It is exceptional to assume that the samples Apollo 16 introduced again greater than half a century in the past nonetheless have secrets and techniques to disclose concerning the moon’s historical past, and that they may but assist form how we discover the photo voltaic system within the a long time to come back,” Nottingham stated.

This analysis is described in a paper revealed Oct. 15 within the journal Meteoritics & Planetary Science 



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