Mission control confirmed end of operations at 3:40 p.m. EDT (1934 UTC), when no signal was detected by NASA’s Deep Space Network station at Goldstone.
There may be an ice cap at Pluto's pole, as seen in the most recent images from the New Horizons spacecraft, now only 11 weeks from its historic flyby on July 14.
Unpiloted craft carries 6,000 pounds of food, fuel, and supplies for International Space Station. Thursday's rendezvous with ISS cancelled. The cargo craft may be lost.
Deadline for submissions in the NameExoWorlds contest is June 15, 2015. Fifteen stars and 32 planets (47 objects total) in 20 solar systems available for naming.