The United Arab Emirates' Amal spacecraft recently flew within 62 miles (100 kilometers) of Deimos.
Deimos is a tiny Martian moon that was thought to be a captured asteroid from space.
But new close-up photos from the Amal spacecraft suggest its origins are closer to home.
The United Arab Emirates' Amal spacecraft flew within 62 miles (100 kilometers) of Deimos last month and the close-up shots were released Monday.
Instead, they say the moon appears to be of Martian origin — perhaps from the bigger Martian moon or from Mars itself.