All right, NASA page is back up. Here's what it says.
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Pictures of astronauts sent from the Moon don't include stars in the dark lunar sky. How could that be? Did NASA's film makers forget to turn on the stars? Most people who take photos know the answer: it's hard to take a picture of something very bright and something else very dim on the same photo. Ever watch a TV program or movie with outdoor night scenes? Unless the movie producers fake stars in the sky, or use special cameras, you just don't see stars. The cameras are adjusted for the actors, and the stars in the background are too dim to see.
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Everyone has seen the video of astronauts planting a US flag on the Moon. You can see the flag flexing and rippling. How can that be? There's no breeze on the Moon. But then, there's no atmosphere, either. When the astronauts planted the flagpole they twisted it back and forth to sink it into the lunar soil. On the Earth, that would have made the flag "wave" for a few seconds, then stop. But that's because the flag pushes against air as it flaps, and the air slows it down. On the Moon, there was no air to stop the flag's motion, so it continued, just as Newton's First Law of physics says it should. So of course the cloth flag waved and rippled beneath the metal rod holding it out.
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Russia, China, East Germany and other cold-war enemies of the USA closely monitored the lunar missions. It was easy to tell whether the Apollo radio signals were coming from the direction of the Moon, and whether the time delays in conversation matched the distance the signals had to travel. If anything had seemed wrong, surely these unfriendly countries would have loudly shouted to the world that the USA was pulling a hoax! Yet none of them ever questioned NASA's accomplishment. When even your enemy gives you credit for something, it's pretty convincing!
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[...]Dr. McKay says that faking a Moon rock to fool scientists around the world would be next to impossible. "It would be far easier to just go to the Moon and get one!" he says.
Makes perfect sense to me. So no, I don't think it's a hoax.