An anonymous reader quotes a report from Phys.Org: With more private spaceship traffic expected at the International Space Station in the coming years, two U.S. astronauts embarked on a spacewalk Friday to install a special parking spot for them. Americans Jeff Williams and Kate Rubins switched their spacesuits to internal battery power at 8:04 (1204 GMT) and floated outside the orbiting laboratory to begin the work of attaching the first of two international docking adaptors. The spacewalkers finished the task in just over two hours. "With that, we have a new port of call," said NASA commentator Rob Navias, as the space station flew over Singapore at 10:40 am (1440 GMT). NASA describes the docking adaptor as a "metaphorical gateway to a future" that will allow a new generation of U.S. spacecraft -- the first since the space shuttle program ended in 2011 -- to carry astronauts to the space station. The second docking adaptor is expected to be installed in 2018. Built by Boeing, the circular adaptor measures around 42 inches (one meter) tall and about 63 inches wide. The adaptors will work with Boeing's CST-100 Starliner and SpaceX's Crew Dragon, two spaceships under construction that are planned to ferry astronauts to the space station. The docking adaptor is more sophisticated than past equipment because it will allow automatic parking instead of the current grapple and berthing process, which is managed by astronauts.