NEW YORK -- Fifty years after Neil Armstrong and Buzz Aldrin walked on the moon, some people insist it never happened and was all a big hoax by the U.S. government.

The suspicions arose even as the lunar landing was taking place in 1969, said Roger Launius, NASA's former chief historian. Soon, conspiracy theories that said it was an elaborate, Hollywood-style production created on a soundstage on Earth started to take root.

The notion is treated mostly as a punchline, as in a new commercial for Red Bull. But public opinion polls over the years have consistently shown roughly 5% to 6% of Americans believe the moon landing was faked, Launius said.

Aldrin once ran into one of those people in 2002 and punched him in the face after the man called the former astronaut a liar.

Here's a look at some of the most common claims and how they're explained away:

CLAIM: The American flag in photos from the moon looks as if it's flapping in the wind. That would be impossible, since there's no air on the moon.

THE FACTS: Rather than let the flag droop, NASA decided to use a right-angled rod to keep it spread out, according to Launius. Armstrong and Aldrin accidentally bent the rod a little bit, making it look as if the flag was in motion. They were also worried that the flagpole was going to fall down after they had twisted it into the ground, so they quickly snapped the photos, capturing the flag while it was still moving, Launius said.

CLAIM: No stars show up in the background of any photographs because NASA knew astronomers would be able to use them to determine whether the pictures were taken on Earth or the moon.

THE FACTS: The shutter speeds on the astronauts' cameras were too fast to capture the faint light of the stars, astronomer Emily Drabek-Maunder at the Royal Observatory Greenwich in London said. NASA used high shutter speeds to make sure the pictures weren't overexposed from the bright light on the moon.

CLAIM: When the lunar module descended onto the moon's surface, it didn't scatter any dust and didn't leave a crater from the rocket blast that slowed its descent.

THE FACTS: In landing on the moon, the astronauts were traveling horizontally for a while, so the thrusters weren't pointed down and wouldn't have kicked up any dust, Drabek-Maunder said. But when the module finally did touch down, "you can see dust actually being thrown up."

As for the lack of a crater, Launius said the astronauts didn't need to use a large blast to slow themselves down, because the moon's gravity is roughly one-sixth that of Earth's. "It was more of a gentle landing," he said.

CLAIM: Armstrong and the lunar module are seen reflected in Aldrin's helmet visor in an iconic photo of Aldrin in his spacesuit on the moon. But there's no sign that either astronaut is holding a camera. So who took the picture?

THE FACTS: The astronauts' cameras were mounted on their chests, Drabek-Maunder said. As a result, Armstrong did not have to hold his up to his eye. His hands, in fact, appear to be near his chest in that picture.

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