Artificially made Mars Dome photographed by Opportunity Mars Rover

Two panoramic images taken by Mars Rover Opportunity on July 10, 2015 show what appears to be a dome.

The isolated spherical structure sits on top of a hill and it looks quite different than the surrounding rocks and soil.

A glow or light in the middle of the dome suggests it may be metallic and reflecting sunlight. Or it could be a window emitting internal light. To the right of the dome you can see a smaller construction.

If this dome is not natural and it is indeed a building-like structure, could it be an outpost, a storage facility or a living quarter?

We may wonder who made it!

SOL 4073

Link original images:

http://mars.nasa.gov/mer/gallery/all/1/p/4073/1P489773398EFFCNK6P2413L7M1.HTML

http://mars.nasa.gov/mer/gallery/all/1/p/4073/1P489773398EFFCNK6P2413R1M1.HTML