An old photograph may solve the mystery of what happened to Amelia Earhart, the famous pilot who disappeared on a round-the-world flight 75 years ago.

Earhart was the first woman to fly alone across North America and back, and the first woman to fly alone across the Atlantic Ocean without stopping.

In 1937, she and a navigator, Fred Noonan, set out to fly around the world. They had travelled more than two-thirds of the way when their plane disappeared over the Pacific Ocean. Ships and airplanes searched the area, but they were unable to find any trace of the plane or its crew.

What happened to them has remained a mystery. One theory is that the plane ran out of fuel and was forced to land on a tiny island called Nikumaroro, about halfway between Australia and Hawaii.

An organization called The International Group for Historic Aircraft Recovery (TIGHAR; pronounced “tiger”) has been searching for Earhart’s plane. The group has an old photograph of Nikumaroro that was taken about three months after the plane disappeared.

Recently, they used new technology to make the picture clearer. Now they believe that a dark shape in the picture, sticking up out of the water, may be part of Earhart’s plane.