Aug. 31 (UPI) -- Elon Musk's SpaceX launched 28 more satellites into low-Earth orbit on Sunday as the company continues to build out its constellation. The satellites were launched by a Falcon 9 rocket at 7:49 a.m. local time from Space Launch Complex 40 at the Cape Canaveral Space Force Station in Florida, the company said in a statement . After separation, the rocket's first stage booster, numbered B1077, returned to Earth and landed on a barge called Just Read the Instructions in the