Live coverage: Atlas 5 countdown and launch journal

Two NASA astronauts and an Italian flight engineer took shelter in the space station’s Russian segment Wednesday as mission control analyzed a possible leak of toxic ammonia coolant aboard the complex. Initial data indicated it was likely a false alarm.

The next satellite to launch from Cape Canaveral — an essential communications satellite for the U.S. military and allied nations — was moved to the pad and mounted atop its Delta 4 rocket today.

The military-run Eastern Range at Cape Canaveral remains ready to support upcoming launches — including an Atlas 5 flight Thursday — amid the coronavirus pandemic, officials said Tuesday.