Jupiter-bound spacecraft faces antenna deployment issue.

The European Space Agency's Juice spacecraft, which is bound for Jupiter, has experienced a problem with its 52-foot radar antenna, which only unfolded one-third of the way following liftoff. Engineers suspect a tiny pin may be protruding and plan to fire the spacecraft's engine in hopes of shaking the pin loose. The radar antenna is needed to peer beneath the icy crust of three Jupiter moons suspected of harboring underground oceans and possibly life.