NASA's Mars rover Curiosity has captured pictures of two Mars moons in eclipse. These pictures have been clicked for the first time. Phobos and Deimos are the Mars's two moons being talked about.

Phobos is larger than Deimos and has been shown passing in front of Deimos. Texas A &M University's Mark Lemmon is co-investigator for the use of Curiosity's Mast Camera. He said that the pictures will help scientists gain insight into moon's orbits and Mars itself.

"The ultimate goal is to improve orbit knowledge enough that we can improve the measurement of the tides Phobos raises on the Martian solid surface, giving knowledge of the Martian interior", he said.

He said that also they could also get access to data to detect density variations in Phobos and to determine if Deimos' orbit is systematically changing.

He said that the ultimate motive is to gain enough orbit knowledge so as to improve the measurement of the tides that Phobos raises on the solid surface of Mars.

The unique view of the two Martian moons was captured by Curiosity's Mastcam telephoto-lens camera on Aug 1. However, the full resolution visuals could not be sent back on earth until a week later after being considered a low priority transmission.