CAPE CANAVERAL, Fla. — A new crew rocketed toward the International Space Station on Friday to replace the astronauts who returned to Earth early in NASA's first medical evacuation . SpaceX launched the replacements as soon as possible at NASA’s request, sending the U.S., French and Russian astronauts on an expected eight- to nine-month mission stretching until fall. The four should arrive at the orbiting lab on Saturday, filling the vacancies left by their evacuated colleagues last month and