An image of Mercury with gravitational anomalies shown in false-color, superposed on an image of the planet's cratered surface. Red hues indicate areas of slightly higher gravity, which in turn indicates areas that must have unusually dense matter under the surface. [2400x3000]

http://apod.nasa.gov/apod/image/1505/MercuryGravity_MESSENGER_2400.jpg via /r/spaceporn http://www.reddit.com/r/spaceporn/comments/34yeku/an_image_of_mercury_with_gravitational_anomalies/