The moon is about 240,000 miles away from the earth, whereas the Hubble Telescope orbits approximately 380 miles above the earth.
"This I don't fault people for, it's a technical question," Germann said. "Because of the way the Hubble is operated it can't resolve an object that small.
"In one sense I guess it's good that people are interested enough to doubt [the moon landing]. It's an iconic event, it stands for a whole era. And for that reason it's important to people," Germann said.
But he has little patience for the skeptics. "To say it's a fake is an insult to the many people who worked on this and risked their lives to make it happen. That's what gives it an edge for me."