NASA’s orbiting Messenger spacecraft took the image while searching for vulcanoids — small rock like objects that scientists believe float in clusters between Mercury and the sun.
The smaller sphere shaped object next to the earth is our moon.
Messenger has not yet detected any vulcanoids and will only be able to search for them when its orbit drags it closer to the sun. As it travels through the solar system, the spacecraft will complete one fly-by of earth, two of Venus and three of Mercury. It will move into Mercury’s orbit in 2011.
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