Ariel Winter admits he mistook Lance Armstrong for Neil Armstrong during the Stars On Mars premiere on Fox

Ariel Winter admitted he mistook cyclist Lance Armstrong for the late astronaut Neil Armstrong during Monday’s season premiere on Stars On Mars on Fox.

The 25-year-old Modern Family star was one of 12 celebrities to join a habitat in Australia, including 51-year-old Lance.

When Ariel met Lance, she said she was surprised to see a “real astronaut” join them, drawing a puzzled look from fellow contestant Porsha Williams Guobadia, 41.

Lance Armstrong is a real f***ing astronaut. Google him. He’s so cool,” Ariel said.

The disgraced cyclist Lance, meanwhile, admitted that people in their twenties often confuse him with Neil Armstrong.

“I’d be dead,” Lance said.

Porsha was later pulled aside by Ariel who admitted her mistake.

“I just realized I made a big mistake,” Ariel said.

“Who did you think he was?” Porsha asked.

“Neil Armstrong,” Ariel replied, causing Porsha to burst out laughing.

“That’s funny,” said Tinashe, 30, when she learned of Ariel’s mistake.

Ariel said in a confessional that her fears had come true.

“That was part of my fear of coming on this show, that I would say something stupid and I literally… I outdid myself,” Ariel said.

Space theme: The 25-year-old Modern Family star was one of 12 celebrities to join a habitat in Australia, including Lance, 51

Real astronaut: ‘Lance Armstrong is a real f***ing astronaut. Google him. He’s so cool,” Ariel said

Cracking up: Porsha Williams Guobadia laughed when Ariel told her about the Armstrong mistake

Funny stuff: “That’s funny,” said Tinashe, 30, when she learned of Ariel’s mistake

“Don’t take yourself too seriously,” Porsha advised.

Neil Armstrong became the first man to walk on the moon in 1969 and died in 2012 at the age of 82.

Ariel was nominated as “base commander” on the show, but she quickly turned it down.

“My biggest fear is failure,” Ariel revealed.

Christopher Mintz-Plasse, 33, was “extracted” on the season premiere when he became the first celebrity to be eliminated.

Vanderpump Rules star Tom Schwartz, 40, was about to be eliminated at the end of the hour-long show, along with Christopher and figure skater Adam Rippon, 33, but he was deemed “mission critical” and remained with Adam on the show.

Outdone herself: “That was part of my fear of coming on this show, that I would say something stupid and I literally… I outdid myself,” said Ariel

Moonwalk: Neil Armstrong became the first person to walk on the moon in 1969 and died in 2012 at age 82

Stars together: Twelve celebrities were on the season premiere of Stars On Mars, including Lance, pictured standing

Stars On Mars featured Star Trek legend William Shatner, 92, who served as mission director and spoke to the astronauts from mission control remotely.

Marshawn Lynch, 37, was the crew’s first “base commander” and enjoyed his own private quarters and bathroom.

Famous astronauts also included: Ronda Rousey, Tallulah Willis, Richard Sherman, and Natasha Leggero.

Stars On Mars returns next week on Fox.