Photos: Atlas 5 rocket aims for International Space Station

After an 11-day delay, SpaceX planned to deploy 60 more Starlink broadband satellites with a Falcon 9 rocket launch scheduled for 10:22 a.m. EDT (1422 GMT) Monday from NASA’s Kennedy Space Center in Florida. But SpaceX scrubbed the launch less than a minute before liftoff due to bad weather.

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.

After four years of brainstorming, custom tool development and training, two astronauts plan to venture outside the International Space Station Friday for the first of four spacewalks to repair a $2 billion cosmic ray detector. The excursions are considered the most challenging since work to service the Hubble Space Telescope.