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Two trenches dug by Phoenix's Robotic Arm.

Mars' Victoria Crater at Meridiani Planum seen in this image taken by NASA's High Resolution Imaging Science Experiment

New image from NASA's Mars Exploration Rover Opportunity show iron meteorite.

An impact crater on Mars is seen in an image taken by Orbiter.

Curiosity appears as a bluish dot near the lower right corner of this enhanced-color view from Orbiter taken June 2013.

A rock outcrop called Link pops out from a Martian surface. Rounded gravel fragments, or clasts, up to a couple inches in size are in a matrix of white material. The outcrop characteristics are consistent with a sedimentary conglomerate, or a rock that was formed by the deposition of water and is composed of many smaller rounded rocks cemented together. Scientists enhanced the color in this version to show the Martian scene as it would appear under the lighting conditions we have on Earth.

The northern-most sand dunes are seen as they begin to emerge from their winter cover of seasonal carbon dioxide (dry) ice.

A view of the Noctis Labyrinthus region of Mars, perched high on the Tharsis rise in the upper reaches of the Valles Marineris canyon system.

Inclined layering known as cross-bedding in an outcrop called Shaler on a scale of a few tenths of a meter.

A cliff, up to 4,000 m high, located in the eastern part of Echus Chasma.

Echus Chasma is an approximately 100 km long and 10 km wide incision in the Lunae Planum high plateau north of Valles Marineris, the Grand Canyon of Mars. Images taken by ESA's Mars Express of Echus Chasma.

Part of the wall of Gale Crater. Here, a network of valleys believed to have formed by water erosion enters Gale Crater from the outside.

The base of Mars' Mount Sharp.

Portions of the Martian surface showing many channels from 1 meter to 10 meters wide on a scarp in the Hellas impact basin.

A view of Ophir Chasma on the northern portion of the vast Mars canyon system, Vallles Marineris, taken by NASA's Mars Reconnaissance Orbiter.

Nili Patera, one of the most active dune fields on the planet Mars.

The surface of the planet Mars inside Gale Crater.

Rough spherical features in an area called Yellowknife Bay. These features are interpreted as concretions, implying they formed in water that percolated through pores in the sediment. Spherical concretions have previously been discovered in other rocks on Mars.

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