An Atlas V rocket sends a secret U.S. space plane into orbit [Updated]

The booster sent an X-37B space plane into orbit for the U.S. Space Force, where the uncrewed vehicle is likely to remain for a couple of years before returning to Earth.7:15am ET Sunday Update: After Saturday's scrub due to a poor weather, an Atlas V rocket is again being prepared for launch on Sunday morning. And launch weather officer Jessica Williams predicts an 80 percent chance of acceptable conditions at the opening of the window, at 9:14am ET (13:14 UTC).The webcast for the launch of the Space Force's secretive space plane, embedded below, will open about 20 minutes before that time.10:30am ET Update: Alas, the weather never did quite cooperate on Saturday. The rocket remains fueled with liquid oxygen and kerosene and is ready to fly.Original post: Engineers and technicians with United Launch Alliance were preparing an Atlas V rocket for launch on Saturday morning from Cape Canaveral Air Force Station in Florida.The rocket has an approximately 150-minute launch window that opens at 8:24am ET (12:24 UTC).