 Discover Magazine |
Petitioners Push for Pluto Probe Postage Stamp
Space.com by Robert Z. Pearlman, collectSPACE.com Editor In 1991, the US Postal Service (USPS) issued a stamp depicting the now on-again, off-again planet Pluto with the inscription "Not Yet Explored." Now, the team behind NASA's first mission to the last planet … Recommended: Petition pushes for a Pluto stamp |
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