Black NASA astronaut is replaced in sudden crew shuffle

Jeanette Epps, 46, a former CIA agent turned astronaut, was about to become the first African-American to embark on a mission lasting several months at the International Space Station.It's still unclear why, but plans for her June liftoff suddenly changed, and another astronaut was chosen in her place, NASA has announced."Epps has returned to the active astronaut corps at Johnson Space Center to assume duties in the astronaut office," Dean added.