A Space X rocket carried 10 communications satellites into orbit from California on Sunday, two days after the company successfully launched a satellite from Florida.
The Falcon 9 rocket blasted off through low-lying fog at 1:25 p.m. PDT from Vandenberg Air Force Base northwest of Los Angeles. It carried a second batch of new satellites for Iridium Communications, which is replacing its orbiting fleet with a next-generation constellation of satellites.
About 7 minutes after liftoff, the rocket’s first-stage booster returned to earth and landed on a floating platform on a ship in the Pacific Ocean, while the rocket’s second stage continued to carry the satellites toward orbit.
A SpaceX Falcon 9 on Friday launched from Cape Canaveral, Florida and boosted a communications satellite for Bulgaria into orbit. Its first stage was recovered after landing on a drone ship in the Atlantic.
Billionaire Elon Musk, who founded Hawthorne, California-based SpaceX, believes reusing rocket components will bring down the cost of space launches.
Iridium plans to put in place 75 new satellites for its mobile voice and data communications system by mid-2018, requiring six more launches, all by SpaceX.
The $3 billion effort by the McLean, Virginia, company involves complex procedures to replace 66 operational satellites in use for many years. Some of the new satellites will be so-called on-orbit spares, or older satellites that remain in orbit on standby for use if the newer ones malfunction.
Swapping out and deorbiting some old satellites has already begun, Iridium CEO Matt Desch said in a pre-launch call with reporters.
Several old satellites have been moved into lower orbits to use up their remaining fuel and configure the solar panels for maximum drag so they will re-enter the atmosphere and burn up.