First Detection of Thorium (atomic no. 90) in Another Galaxy

The discovery of thorium in the Ursa Minor Galaxy offers the first chance to
measure another galaxy's age via radioactive dating, say astronomers in
Japan. Furthermore, the abundance of thorium and other heavy elements hints
that this galaxy evolved differently than the Milky Way.

Thorium is a heavy, radioactive element with an atomic number of 90. Thus,
each thorium atom has ninety protons in its nucleus. Until now, no one had
seen such a heavy element beyond our Galaxy. For the full story, please see
http://KenCroswell.com/ThoriumUrsaMinor.html .

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