NEW YORK — More than four decades after the Apollo 11 moon landing, a cloth bag full of souvenirs brought back by astronaut Neil Armstrong has come to light.

Among the trove: a 16 mm movie camera from inside the lunar module that filmed its descent to the moon and Armstrong’s first steps on the lunar surface in 1969.

That camera “took one of the most significant sets of images in the 20th century,” said Allan Needell, a curator in space history at the National Air and Space Museum.

In an interview Monday, Needell said the museum had been told about the bag in June 2013 by Armstrong’s widow, who had found it while cleaning out a closet in their suburban Cincinnati home. Armstrong died in 2012.

The long process of documenting the find concluded only recently, and that’s when the museum decided to go public, he said.

The discovery was revealed Friday by the museum, which is already displaying the camera in a temporary exhibit.

Needell noted that the images taken by the camera are far more detailed and clear than the grainy ones shown on TV at the time of the landing. The film cartridges had been removed during the mission and so the device itself was no longer needed.

The camera would have stayed on the lunar module, which crashed on the lunar surface after delivering the astronauts back to the orbiter, Needell said, but Armstrong, Buzz Aldrin and Michael Collins “decided to take some souvenirs home with them.”