An image of Ceres taken by NASA's Dawn spacecraft shows that the brightest spot on the dwarf planet has a dimmer companion. NASA/JPL-Caltech/UCLA/MPS/DLR/IDA hide caption

itoggle caption NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

An image taken with the NASA/ESA Hubble Space Telescope of the galaxy cluster SDSS J1038+4849 shows that it seems to be smiling. The space agency says it's the result of a symmetrical alignment of the galaxy cluster and the telescope — along with a powerful gravity field that can bend light. NASA & ESA hide caption

itoggle caption NASA & ESA

Leland Melvin with his dogs, Jake and Scout. "I snuck them into NASA to get this picture," Melvin says. Courtesy of Leland Melvin hide caption

itoggle caption Courtesy of Leland Melvin

The Orion capsule is poised to make its first test flight Thursday. If all goes as planned, the unmanned vehicle will orbit Earth twice before splashing into the Pacific Ocean. Kim Shiflett/NASA hide caption

itoggle caption Kim Shiflett/NASA

International Space Station Commander Barry "Butch" Wilmore holds up the first object made in space with 3-D printing on Nov. 25. NASA hide caption

itoggle caption NASA