NASA has published an image showing “sorta circular” spots in the Arctic sea ice, but it doesn’t know what they are or what caused them.
The landscape features were captured during an annual mission called Operation IceBridge, the space agency explained.
Mission scientist John Sonntag saw the circles during a flight on April 14; he captured an image of them later released by NASA.
Every year, NASA’s Operation IceBridge takes place over the planet’s polar regions; this year marked mission 10 over the Arctic.
During this time, researchers map sea and land ice; this year, a mystery was discovered.
According to the space agency, Sonntag noticed the unusual circles and holes while on a P-3 research plane.