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Word: helium (lookup in dictionary) (lookup stats)
Dates: during 2010-2019
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Astronomers can determine how long ago a star was created by measuring its metal content because stars that contain more elements beyond hydrogen and helium are newer than “metal-poor” stars like the one found in the Sculptor Galaxy...

Author: By Julie R. Barzilay, CRIMSON STAFF WRITER | Title: Star Nearly As Old As Universe Found | 3/26/2010 | See Source »

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