Live coverage: Two satellites blast off on Ariane 5

SpaceX’s Falcon 9 rocket ignited its nine Merlin main engines for several seconds Thursday at launch pad 39A in Florida, moving the previously-flown booster closer to a scheduled blastoff Monday with a Bulgarian communications satellite.

Flying for the first time this year, a Proton rocket streaked into space Thursday from the Baikonur Cosmodrome in Kazakhstan with two Russian Express communications satellites that will beam television, radio and broadband signals across the country.

A United Launch Alliance Atlas 5 rocket lifted off at 7:50 a.m. EDT (1150 GMT) Thursday from pad 41 at Cape Canaveral Air Force Station with NASA’s Mars 2020 Perseverance rover.