Stats: Atlas 5 and Delta 4 histories and backlogs (updated April 20)

After several delays earlier this week, SpaceX conducted a hold-down test-firing of a Falcon 9 rocket at Cape Canaveral Friday evening in a key test before launch next week on a resupply mission to the International Space Station.

Another batch of Atlas 5 rocket launch photos from Wednesday’s flight for the U.S. Navy carrying the Mobile User Objective System spacecraft.

Watch a replay of the launch of an Atlas 5 rocket carrying the $1.2 billion SBIRS GEO Flight 4 satellite into orbit.