American space agency NASA has released some new close-up images of Ceres, revealing the dwarf planet’s mysterious bright spots in unprecedented detail.

The images, captured by the space agency’s space probe Dawn from just 240 miles above the surface, provides a closer look at Ceres surface that shows distinctive bright spots. The images unveil a dome covered with the bright material.

For the first time, scientists could look at the dwarf planet’s Occator Crater. The crater, which measures around 2.5 miles deep and 57 miles across, contains the two bright spots that perplexed researchers for years.

However, even the new images failed solve the mystery of bright spots, but the images finally provided scientists with something to work with.

Chris Russell, principal investigator for NASA’s Dawn Mission, said, “The bright spots in this configuration make Ceres unique from anything we’ve seen before in the solar system. The science team is working to understand their source.”

The Dawn spacecraft was the first mission to reach Ceres as well as the first space probe to orbit two distinct extraterrestrial objects. In 2011, it orbited Vesta. It has been orbiting Ceres for more than a year, getting closer to the dwarf planet over time.