CAPE CANAVERAL, Fla.—Astronauts finished unfurling a new pair of solar panels outside the International Space Station on Friday, making their third spacewalk in just over a week. NASA’s Shane Kimbrough and France’s Thomas Pesquet successfully installed the second in a series of powerful solar wings that should keep the space station running the rest of this decade, as space tourism ramps up with visitors beginning in the fall. “We have a lot of happy faces down here,” Mission Control radioed as power surged through the panel. It should have been a two-spacewalk job, but spacesuit and other problems hampered the astronauts’ work on June 16. As a result, the first solar wing wasn’t extended to its full length of 63 feet (19 meters) until Sunday. NASA added a third spacewalk for Friday to attach and unfold the second wing—this time everything went smoothly 255 miles (410 kilometers) up. Once Pesquet …