Ground teams at Kennedy Space Center prepared on Saturday for a second try at launching NASA's towering, next-generation moon rocket on its debut flight, hoping to have remedied engineering problems that foiled the initial countdown five days earlier.
It also signals a major change in direction for NASA's post-Apollo human spaceflight program, after decades focused on low-Earth orbit with space shuttles and the International Space Station.
The new moon program has enlisted commercial partners such as SpaceX and the space agencies of Europe, Canada and Japan to eventually establish a long-term lunar base of operations as a stepping stone to even more ambitious human voyages to Mars.Getting the SLS-Orion spacecraft off the ground is a key first step. Its first voyage is intended to put the 5.
Barring last-minute difficulties, Saturday's countdown should end with the rocket's four main RS-25 engines and its twin solid-rocket boosters igniting to produce 8.8 million pounds of thrust, about 15% more than Saturn V, sending the spacecraft streaking skyward. The spacecraft also is set to release a payload of 10 miniaturized science satellites, called CubeSats, including one designed to map the abundance of ice deposits on the moon's south pole.
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