Boeing's Starliner rolled off launch pad to replace 'buzzing' rocket valve (photo)

Boeing's Starliner capsule has left the launch pad. Starliner and its rocket ride, a United Launch Alliance (ULA) Atlas V, rolled off the pad at Florida's Cape Canaveral Space Force Station today (May 8), heading to an assembly building at the site so scientists can replace a misbehaving valve in the launcher's upper stage. The duo could be back soon, however: They're scheduled to launch no earlier than May 17, kicking off Starliner's first-ever astronaut mission, a trial run to …