Word: thorium
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Dates: during 2000-2000
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...between 8 billion and 12 billion years. But other experts insisted they knew of stars that were at least 14 billion years old--obviously a problem, since stars can't be older than the cosmos. Using the VLT, though, observers have measured minute traces of radioactive uranium and thorium in the oldest stars--a technique akin to radiocarbon dating--and proved that they're more like 12 billion years old (the age of the universe, meanwhile, is now estimated at 14 billion years...