The triangular peak was spotted by NASA's Dawn spacecraft as it orbited 2,700 miles above the distant dwarf planet.
The mountain towers three miles above Ceres' flat surface - more than half the height of Everest.
"Curiouser & curiouser. @NASA_Dawn sees pyramid-shaped peak," NASA tweeted after taking images of the mystery mountain.
As the craft gets closer to Ceres - the largest object in the main asteroid belt between Mars and Jupiter - more and more features are beginning to reveal themselves.
Story and source: SKY