▲The rough spherical features in an area called Yellowknife Bay are interpreted as concretions, implying they were formed by water that oozed through pores in the sediment.

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This image shows the base of the Red Planet's Mount Sharp, officially Aeolis Mons, which rises 5.5 km (3.4 miles) from the valley floor.

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Located on top of a lava bed at the site of an ancient volcano, Nili Patera is one of the most active dune fields on the planet Mars.

▲These viscous, lobate flow features found in the mid-latitudes of Mars resemble terrestrial moraines, suggesting that these deposits are ice-rich, or may have been ice-rich in the past.

▲A view of one of Mars' canyons, located on the northern portion of the planet's vast canyon system.

▲This plain serves as the fictional landing site of a crewed mission named Ares 3 in the best-selling novel and film 'The Martian.'

▲This image of an impact crater on Mars was captured by an orbiter.

▲The channels on the Hellas Planitia basin range from 1 to 10 m in width.

▲This rock outcrop, called Link, show rounded gravel fragments, or clasts, that are up to a couple of centimeters in size.

▲These are Mars' northern-most sand dunes and can be seen as they emerge from a winter cover of seasonal carbon dioxide (dry) ice.

▲Perched high on the Tharsis rise in the upper reaches of Valles Marineris, this region is notable for its maze-like system of deep, steep-walled valleys.

▲The car-sized rover designed to explore Gale crater appears as a blue dot near the lower right corner of the image.

▲Pictured is part of Gale crater's wall where a network of valleys believed to have formed by water erosion enters the crater from the outside.

▲This rock formation is called Shaler.

▲This image shows the Columbia Hills, a range of low hills inside Gusev crater.

▲The impact crater located in the Meridiani Planum plain is roughly 730 m wide and named after one of Ferdinand Magellan's five ships, the first to circumnavigate the globe.

▲Estimated to be between 3.5 and 3.8 billion years old, this crater is probably also a dry lake near the northwestern part of the Aeolis quadrangle.

▲This image shows dark, narrow, 100 meter-long streaks believed to have been formed by flowing water.

▲The image of this iron meteorite was captured by NASA's Mars Exploration Rover Opportunity.

▲These dark, narrow streaks emerging out of the walls of Garni crater are called recurring slope lineae.

▲This is the percussion drill at the end of the Curiosity Robotic Arm, which is making contact with the rock surface on January 27, 2013.

▲This image shows a perspective view of a mountain in eastern Hellas Planitia where large glaciers were detected hidden under rocky debris.

▲This circular depression on Mars's surface was captured by NASA's Mars Reconnaissance Orbiter in February 2015.

▲This is one of the first color images of Mars's surface taken after the Phoenix Mars lander spacecraft landed successfully on May 25, 2008. It was the first-ever touchdown near Mars's north pole.

▲This mound appears to have blocked the path of dunes as they move south (to the right of this image).

▲This is a different perspective view of the mountain in eastern Hellas Planitia where large glaciers were detected hidden under rocky debris.

▲These two trenches were dug by the Robotic Arm of the Phoenix lander.

▲The Red Planet is seen here in this NASA Hubble Space Telescope.

▲Shallow pits can be seen in the bright residual cap of carbon dioxide ice next to a deeper, circular formation that penetrates through the ice and dust, which could be an impact crater or a collapse pit.

▲This image captured by NASA's Mars Reconnaissance Orbiter shows an interesting rugged cliff edge.

▲Located on the northwest rim of Isidis Planitia impact basin, Nili Fossae is one of Mars's most colorful regions.

▲An aircraft can be seen flying past with the crescent moon and planets Venus and Mars visible nearby.

▲This image taken by the Opportunity rover shows a puzzling rock formation.

▲This image captured by NASA's Mars Reconnaissance Orbiter shows frost on Mars's surface.

▲This evenly-layered rock formation displays pattern typical of a lake-floor sedimentary deposit, suggesting a lake once filled this crater.

▲The Curiosity rover drilled into this rock target, nicknamed Cumberland.

▲Rocky cliffs in the foreground named Cape Verde are located on the rim of Victoria crater. The cliffs were named after the country in honor of Ferdinand Magellan, who visited Cape Verde on his voyage around the world.

▲This is the Alpha Particle X-Ray Spectrometer seen with the Martian landscape in the background.

▲This is the top of Bathurst Inlet, a rock on the surface of Aeolis Palus in the Gale crater.

▲These water flows appear in the spring and summer on a slope inside of the Newton crater.

▲This is an outcrop at the Sheepbed, a mudstone deposit in the Yellowknife Bay area inside Gale crater.

▲Marquette Island is a rock about the size of a basketball whose texture composition suggest came from deep inside the Martian crust.

▲The pattern in this sedimentary bedrock within Becquerel crater suggests rhythmic bedding.

▲NASA's Phoenix lander can be seen hanging from its parachute as it descends to the Martian surface.

▲Valles Marineris is Mars's version of the Grand Canyon.

▲This image shows an aerial view of the Echus Chasma, one of Mars' largest water source regions.

▲The Reull Vallis was likely formed by water. The valley got its name from the Gaelic word for planet.

▲This panoramic view of Mars shows a circular topographic view, dubbed Sleepy Hollow, found in the Gusev Crater.

▲This image shows NASA's Mars Pathfinder spacecraft exploring the planet's terrain in 1997.

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This incredibly sharp portrait of Mars was taken when the planet was about 100 million km (60 million miles) from Earth.

▲Researchers believe waterfalls may once have plunged over these 4000-meter-high cliffs on to the valley floor. The smoothness of the valley floor suggests it was later flooded by basaltic lava.

▲This is an artist's conception of the Phoenix lander landing on the Red Planet.

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Browse this gallery and delve into the beautiful landscapes of our celestial neighbor.