For 27 years, the space shuttle has been the center of the U.S. space program and the only means to send crews up to space. But, in a year and a half, the shuttle -- now on its 125th mission -- will be retired by presidential mandate. With only nine or 10 flights left to go, the program is on the brink of a major transition.
So, what's next for NASA when the space shuttle quits flying? In effect, it will be back to the future. NASA will launch two rockets -- not one as they did in the...Full Story