Images of the dwarf planet Ceres are getting clearer and clearer as Dawn spacecraft is getting closer to the planet. A bright spot on the planet's surface was seen in one of its recent images, but it has yet not been understood what this bright spot exactly is.

NASA's Jet Propulsion Laboratory (JPL) is inviting people to help it understand what the mysterious bright spot is. The agency has also set up a website to collect votes of people and ideas about the bright spot.

Although NASA has yet not been able to confirm what the bright spot is, wild guesses for the spot are volcano, geyser, rock, ice, salt deposit and crater. It has been said to be ice by 33% voters, whereas 28% said that it can be a volcano.

Ceres is the largest object between asteroid belt of Mars and Jupiter. It has diameter of about 590 miles. NASA's Dawn spacecraft is the first to study Ceres and another dwarf planet, Vesta.

Mysterious features of two bright spots inside a crater near the dwarf planet's equator have also been captured by Dawn.

Scientists and observers are baffled by these spots and NASA has said that it has no idea about the source or the reason for these bright features. Dawn will provide help to NASA scientists gain some knowledge about the spot to determine what it is.

Dawn is set to travel towards the lower orbit of Ceres next week to capture better view of the dwarf planet. "The approach imaging campaign has completed successfully by giving us a preliminary, tantalizing view of the world Dawn is about to start exploring in detail. It has allowed us to start asking some new and intriguing question", said Marc Rayman, Dawn's mission director and chief engineer at the JPL.