The moon is even older than scientists realized, according to new studies of crystals brought back from the moon by Apollo astronauts in 1972.
The moon’s surface formed at least 40 million years earlier than previously thought, according to a new study of an ancient crystal embedded in: About 4.5 billion years ago, a giant, Mars-size object called Theia slammed into the nascent Earth, ejecting hot debris that coalesced into our moon. But they have debated many of the details — particularly the timing.The new atom-by-atom analysis of a 4.
The problem for Zhang was that he couldn’t be as sure as he needed to be that the date was accurate. Lead can move around within zircon crystals and get stuck in clusters, like raisins in baking bread, potentially meaning that when researchers measure the ratio of lead isotopes, they might overcount it if they hit a cluster, coming up with an inaccurate date.
“The age is probably real,” Nemchin wrote in an email. “With that, we are running into a big problem as a community studying lunar samples.”The problem facing lunar scientists is that the samples they’ve analyzed are about 100 million years apart in age. The new find suggests the magma ocean crystallized 4.46 billion years ago. Meanwhile,“Something is clearly not right in our big conceptual understanding of how Moon evolved,” Nemchin said.
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