You should get the set of planet stamps to go with them.
(of course, Pluto isn't part of that stamp set, but it has its own "Pluto - Explored"(*) set)
(*) In 1991, the USPS issued a set of "Explored" planet stamps (each with a picture of a probe that visited, but for Pluto is said "Not Yet Explored". This provided the impetus for what became the "New Horizons" probe that recently visited Pluto (apparently it costs just $0.29 to send a space probe to Pluto).
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(of course, Pluto isn't part of that stamp set, but it has its own "Pluto - Explored"(*) set)
(*) In 1991, the USPS issued a set of "Explored" planet stamps (each with a picture of a probe that visited, but for Pluto is said "Not Yet Explored". This provided the impetus for what became the "New Horizons" probe that recently visited Pluto (apparently it costs just $0.29 to send a space probe to Pluto).
http://www.astronomy.com/year-of-pluto/2015/06/postage-for-pluto-a-29-cent-stamp-pissed-off-scientists-enough-they-tacked-it-to-new-horizons
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