DALLAS, TX – APRIL 20: Buzz Aldrin receives an award during the EarthxGlobal Gala on April 20, 2018 in Dallas, Texas.

CAPE CANAVERAL, Fla. — Former NASA astronaut Buzz Aldrin was noticeably absent from a gala kicking off a yearlong celebration of the 50-year anniversary of the first moon landing, even though his nonprofit space education foundation is a sponsor and he typically is the star attraction.

The black-tie Apollo Celebration Gala held under a Saturn V rocket at the Kennedy Space Center on Saturday evening featured a panel discussion by astronauts, an awards ceremony and an auction of space memorabilia.

Hundreds of people attended the sold-out event, including British physicist Brian Cox, who presented Virgin Galactic founder Richard Branson with the ShareSpace Foundation’s Innovation award.

Branson, whose company is developing a new generation of commercial spacecraft, said in a recorded video that the Apollo missions influenced his generation.

“Space is still hard, really hard. It still really matters,” Branson said. “There would be no Virgin Galactic, no Virgin Orbit and no spaceship company had it not been for Apollo astronauts and the thousands of talented people who made their mission possible.”

Dr. Carolyn Williams of the nonprofit From One Hand To AnOTHER received the foundation’s Education award, and former Johnson Space Center director Gerry Griffin, a flight director for all of the crewed Apollo missions, was honored with the Pioneer award.

“It’s very humbling, it kind of came out of the blue,” Griffin said. “It is so neat to know that we’ve passed the torch that will let this next generation take us to this next step.”

That next step, Griffin said, is a return of Americans to the Moon and, eventually, Mars — something former Apollo astronauts Walt Cunningham, Harrison Schmitt, Rusty Schweickart and Tom Stafford discussed during a conversation with Cox.

“We’re sort of going through a second door here. The door isn’t all the way open — we haven’t gone all the way through it — but it’s cracked open,” Schweickart, who flew as the lunar module pilot on Apollo 9, told The Associated Press. “Space is going to be much less expensive to go to, and that’s going to open up not just opportunities for people to fly, but because of the decreased cost, real opportunities for innovators to generate new ideas and to do things that have never been done before.”

Aldrin’s ShareSpace Foundation is one of the sponsors of the annual gala, which raises money for Science, Technology, Engineering, the Arts and Mathematics — or STEAM education — and Astronaut Scholarship Foundation scholarships.

Renowned Brazilian pop artist Romero Britto donated artwork from his “Buzz Aldrin Space Series” for the auction, which also included a behind-the-scenes tour of Virgin Galactic in California and autographed space memorabilia. Tickets for the event ranged from $750 to $2,500 per person.

The former astronaut’s expected absence comes just a month after he sued two of his adult children and a former business manager, accusing them of misusing his credit cards, transferring money from an account and slandering him by saying he has dementia. Only weeks before the lawsuit, Andrew and Jan Aldrin filed a petition claiming their 88-year-old father was suffering from memory loss, delusions, paranoia and confusion.

Andrew and Jan Aldrin, as well as business manager Christina Korp, are on the foundation’s board and attended the gala. Aldrin’s oldest son, James, isn’t involved in the legal fight.

Andrew Aldrin acknowledged his father’s absence during the gala.

“We’re sorry dad can’t be here, I know some of you are disappointed,” Aldrin said. “Ultimately, what we’re about is creating the first generation of Martians.”

Buzz Aldrin, along with Neil Armstrong and Michael Collins, was part of the Apollo 11 mission which landed the first two humans on the moon on July 20, 1969.