Video: Groundbreaking for commercial crew access tower

Continuing a series of delays keeping NASA’s Ionospheric Connection Explorer on Earth, NASA announced Tuesday that the satellite’s launch aboard an air-dropped Northrop Grumman Pegasus XL rocket will not occur as scheduled Friday.

A troublesome liquid oxygen valve on the Space Launch System’s first flight-rated core stage will keep NASA from performing a second test-firing of the rocket’s four main engines this week.

Following the same timeline as they will on launch day, NASA astronauts Doug Hurley and Bob Behnken put on their SpaceX flight suits and strapped inside SpaceX’s Crew Dragon spacecraft Saturday at the Kennedy Space Center in Florida.