 The Smithsonian is partnering with the Arden Transit Program for Metro to feature celestial imagery from the Chandra X-ray Observatory. That's at six Metro stations in D.C. and Northern Virginia from now through October 16th. Operated by the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, Chandra is the world's most powerful X-ray telescope, observing the life cycles of stars and galaxies, producing data used by astronomers across the globe to help understand our universe.