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

United Launch Alliance has selected Orbital ATK to provide solid rocket boosters for the company’s next-generation Vulcan launcher, and will switch the workhorse Atlas 5 to the new booster supplier by the end of 2018, officials said Tuesday.

Follow the key events of the Falcon 9 rocket’s ascent to orbit with 64 smallsats on Spaceflight’s SSO-A: SmallSat Express rideshare mission.

NASA’s Perseverance rover has been closed up inside its protective aeroshell, the structure that will protect the spacecraft when it plunges into the Martian atmosphere, in preparation for launch no earlier than July 20 from Cape Canaveral.