The Thursday morning launch of the CALIPSO/CloudSat mission from Vandenberg Air Force Base in California has been postponed 24 hours to Friday morning, April 28, at 6:02 a.m. EDT. Engineers and mission managers are assessing a suspect temperature sensor on the Boeing Delta II rocket's second stage that may require replacement.

CALIPSO and CloudSat are flying into space aboard the swift and dependable Boeing Delta II rocket. With more than 300 successful flights, the dual-stage Delta II is NASA's medium-size payload specialist.