A nearly three-month stoppage of on-site work due to concerns about the spread of the coronavirus at NASA’s Marshall Space Fight Center in Alabama is expected to push back the launch of the IXPE X-ray astronomy satellite from May 2021 until some time later next year, a senior space agency official said.

Vice President Mike Pence plans to travel to the Kennedy Space Center on May 27 for the first launch of astronauts from a U.S. spaceport since 2011.

The mobile service tower retracts from the Atlas 5 rocket, revealing the 191-foot-tall vehicle for liftoff from Vandenberg Air Force Base, California, carrying the classified NROL-79 national security payload for the U.S. government.