Planets Postage: US Postal Service Issues New Solar System, Pluto Stamps

You can now embark on a tour of our solar system — from the innermost planet Mercury to the dwarf planet Pluto — just by visiting your local United States Post Office. The U.S. Postal Service (USPS) is issuing Tuesday (May 31) two sets of postage stamps depicting the eight planets that circle the Sun and the icy world that orbits out beyond them. "The 'Views of Our Planets' and 'Pluto—Explored!' stamps begin their own journeys today — on letters and packages to millions o