ST. PAUL, Minn. (WCCO) – Some of the most famous astronauts in the world came right here to St. Paul Saturday.

Buzz Aldrin is the second man ever to walk on the moon after Neil Armstrong.

On Saturday, he got up close and personal with fans at the Go Boldly Expo in St. Paul.

Karen Nyberg, a native if Vining, Minn. who recently returned from the International Space Station, also greeted fans and signed autographs.

The event aims to get children interested in careers in science.

As the event showed, today’s legends are hoping to shape tomorrow’s big-thinkers.

Space fans come in all ages.

“I really like it. We are doing a lot in school and it’s my favorite subject,” 9-year-old Alayna Peltola said about science.

“Barbie is role model so is our astronaut here Karen Nyberg,” said Dee McLellan

The youngest fans at the Go Boldly Expo in St Paul learned their curiosity can turn into a career.

“For our country to be successful we really need to have the kids to be interested in science, technology, math, engineering,” Nyberg said.

Almost fifty years after Apollo 11, Buzz Aldrin told kids about his walk on the moon.

“Magnificence is the sense of human beings being able to fulfill dreams of, uh, thousands of years,” Aldrin said.

He said his memories mean more now than ever.

“We also did that to develop our own technology, our own capabilities and to learn more science and background information to inspire people to look into future careers,” Aldrin said.

And after reaching something that seemed impossible, these astronauts hope the next generation never stops reaching…

“Humans are born to explore,” Aldrin said.

The Go Boldy Expo was held at the St. Paul Downtown Airport Saturday.