Mercury has a diameter of about 4,880 kilometers (3,030 miles), and the smallest feature visible in this color image is about 10 kilometers (6 miles) in size. First MESSENGER Spectrum of Mercury ...

Mercury has a diameter of about 4,880 kilometers (3,030 miles), and the smallest feature visible in the color image is about 10 kilometers (6 miles) in size.

By eye, Mercury is a relatively uniform grey with splotches of variation in brightness. But MESSENGER’s sensitive cameras have filters on them which isolate different colors, and when put ...