The first space probe to land on a comet has earned a stamp of approval in the United Kingdom. Since Friday (Nov. 14), letters delivered by the Royal Mail in England, Scotland, Wales, and Northern Ireland have been stamped with a special ink postmark celebrating the Rosetta mission's Philae probe's historic landing on Comet 67P/Churyumov-Gerasimenko. The ESA (European Space Agency) lander …
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