'Not Yet Explored' No More: New Horizons Flying Stamp to Pluto

Tuesday, July 7, 2015 - 15:30 in Astronomy & Space

They are three words that, after next week, will never be used to describe Pluto again, and they are about to witness their own expiration: "Not yet explored." The phrase appears on a 1991 29-cent U.S. stamp flying on New Horizons.

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