Still Cataloging The Skies, Long After 'Planet X'

Perched on a mesa just above Flagstaff is the historic Lowell Observatory, founded back in the days of the Wild West. Observatory director Jeffrey Hall talks about landmark discoveries made there, like 'Planet X'--later renamed Pluto--and the exoplanets astronomers are spotting there today.

Source: http://www.npr.org/2011/09/23/140744697/still-cataloging-the-skies-long-after-planet-x?ft=1&f=1007

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