The astronauts who first landed on the moon are not dwelling on their small lunar steps.
Instead, two of them are urging mankind to take a giant leap to Mars.
In one of their few joint public appearances, the crew of Apollo 11 spoke on the eve of the 40th anniversary of man's first moon landing.
First man on the moon Neil Armstrong discussed Apollo 11 for about 11 seconds.
Second man on the moon Buzz Aldrin said the best way to honour the Apollo 11 crew would be to follow in their footsteps and aim for Mars.
Apollo 11 command module pilot Michael Collins said the moon was not interesting, but Mars is.
All three were part of an event on Sunday night at the Smithsonian Institute's National Air and Space Museum.
On Monday, the three astronauts will get another chance to make the pitch for a Mars trip, this time to someone with a little more sway: President Barack Obama.
Apollo 11 command module pilot Michael Collins, who circled the moon alone while Mr Armstrong and Mr Aldrin walked on it, said the moon was not interesting, but Mars is.
"Sometimes I think I flew to the wrong place. Mars was always my favourite as a kid and it still is today," Mr Collins said. "I'd like to see Mars become the focus, just as John F. Kennedy focused on the moon."
