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The moon is 40 million years older than we thought it was

October 24, 2023
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Image of the Moon captured by the Galileo spacecraft

The moon could have fashioned not less than 4.46 billion years in the past – 40 million years sooner than we thought

NASA/JPL/USGS

A reanalysis of lunar rook has pushed again the age of the moon by 40 million years. This implies it fashioned not less than 4.46 billion years in the past.

Scientists suppose the moon got here into existence after a Mars-sized planet smashed into Earth and launched a ball of molten rock into area. Because the magma floor of this object cooled and solidified, silicon crystals referred to as zircons had been fashioned. Due to their resilience to warmth and harsh environments, the crystals nonetheless survive and can be utilized to establish the moon’s earliest moments.

Zircon crystals include radioactive uranium, which decays into lead at a well-defined charge, so scientists can decide a rock pattern’s age by measuring the quantity of lead and uranium in it.

Philipp Heck on the College of Chicago and his colleagues have now reanalysed a pattern of zircons from lunar rock introduced again from NASA’s Apollo 17 mission in 1972, utilizing a method referred to as atom probe tomography, and located that the zircons are 4.46 billion years outdated.

“We now have a date of the zircons, so we are able to inform the time by which the magma ocean should have been solidified, or largely solidified,” says Heck. “It basically anchors the whole lunar chronology. It’s nearly like placing a nail into the lunar timeline.”

The actual zircon pattern that Heck and his workforce checked out had been analysed in 2021 utilizing a sort of mass spectrometry that instructed the pattern was outdated, however the method couldn’t pinpoint whether or not the lead was from radioactive decay or was simply there by likelihood.

Atom probe tomography, nevertheless, can analyse the make-up and place of the atoms in excessive element, which helped present that they actually had been from radioactive decay. It makes use of a beam of charged particles to shave off a particularly skinny part from a pattern, of just some atoms, after which a strong laser evaporates these atoms right into a mass spectrometer.

We all know that the photo voltaic system fashioned about 4.57 billion years in the past, which suggests we are able to constrain the moon’s formation moderately exactly, says Mahesh Anand on the Open College, UK.

“Earlier research have proven that the actual affect that fashioned the moon occurred 50 million years after the formation of the photo voltaic system, so if we use that research, and this work, it’s giving us a really slender time window of solely 50 million years inside which the moon fashioned and solidified very, in a short time,” says Anand.

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