"For Americans, President Kennedy's declaration focused the Space Race on a clear goal: landing a man on the Moon before the Soviets. The Space Race became a race to the Moon. For years, the Soviets officially denied being in a race to the Moon. Now there is ample evidence, including items displayed here, that they indeed competed to reach the Moon first." (airandspace.si.edu)
Answer: Because when Sir Gawain cut off the nights head, the head and reminded him the pact that Gawain had to seek him in a year and a day at the Green Chapel.
