Stunning photos from the Apollo 11 mission are still coming out almost 50 years after a person first walked on the moon.

Michael Collins, who was the Command Module pilot during the historic flight, shared what he says is a previously unreleased photo of the three astronauts in the crew.

"The crew. Found this at the bottom of a box. Don’t think it was ever used by @NASA. #TBT @TheRealBuzz," Collins tweeted Thursday with the "Throwback Thursday" hashtag.

The photo shows Collins standing against a moon replica. Astronauts Buzz Aldrin and Neil Armstrong are photographed on the other side of the moon, with Armstrong's hand on Aldrin's shoulder.

Collins had also signed the photo at some point.

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USA TODAY has reached out to NASA for comment on the photo.

The Orlando Sentinel, which is releasing a 50th anniversary commemorative book on the Apollo 11 mission full of photos from 1969, reported that its staff members didn't recall ever seeing the photo after going through NASA's and its archives for the book.

Collins, now 88, was part of the three-man Apollo 11 crew, which made the first manned lunar landing in July 1969. While Armstrong and Aldrin landed and walked on the moon's surface, Collins stayed in lunar orbit.

Collins was also part of the Gemini 10 mission, which was his first spaceflight and spacewalk.

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Follow USA TODAY's Ryan Miller on Twitter: @RyanW_Miller