Live coverage: Space station crew investigating slow pressure leak

This collection of official NASA photographs captures the United Launch Alliance Atlas 5 rocket rolling to the pad on Monday, successfully blasting off Tuesday and the Cygnus freighter arriving at the International Space Station on Saturday morning.

A United Launch Alliance Atlas 5 rocket departed Cape Canaveral at 11:36 a.m. EDT (1536 GMT) to deploy the Global Positioning System 2F-10 navigation satellite.

NASA has purchased two seats on Russian Soyuz capsules launching later this year and in early 2018 to expand the crew on the U.S. segment of the International Space Station from three to four, and reserved options to fly astronauts on Soyuz spacecraft in 2019 if commercial rides are not available in time.