Kasei Valles is the largest channel carved by water on Mars. And along its course, it contains the biggest dry waterfalls known anywhere.
Ravi Vallis is one of the shortest, yet most dramatic of Martian outflow channels.
Perhaps because it's among the oldest Mars volcanos known, Tyrrhena Mons appears unlike most others on the Red Planet.
In Memnonia Sulci, the wind has carved long ridges in one of Mars' most enigmatic geologic units.
A thick stack of sediments awaits scientists in Gale Crater.
This Martian valley was eroded from below, as lava melted subsurface ice.
Windows into the Martian past appear as erosion strips away layer after layer.
Hills and mesas in Cydonia are covered with material that's likely rich in ice.
Petals of rocky debris encircle a fresh crater, telling of impacts and blast waves.
A meteorite impact on the canyon rim probably set off a giant landslide.
All the geological signs point to a brief, but highly violent flood.
Clay sediments have made Mawrth a top candidate site for NASA's next rover.
Spectacular scenery lies everywhere in Melas Chasma, because it's part of the great Valles Marineris rift.
Young lava plains meet an ancient landscape where they engulf Terra Sirenum's borders.
A ruined crater at the highlands' edge may be a place to look for life.
When technology permits a visit with a rover, Candor will be high on the must-see list.
Most Martian lava is basalt, like Hawaii. But Nili's lava picture isn't so simple.
A big mesa fills much of Hebes, and scientists want to know how it formed.
Wind erosion, lava flows, and impacts have shaped the face of Arabia Terra.
Billions of years of deposition and erosion have scrawled a complex story on a large crater's smooth floor.
This small basin in Valles Marineris likely holds sediments that could preserve traces of early Martian life.
Layers of gypsum in Juventae Chasma recall a water-rich era that may have seen life, too.
Clay sediments in the hills nearby point to ancient wet environments.
Sediment layers going back at least 3 billion years in Martian history make a record book waiting to be opened.
Its mesas were born long ago when groundwater suddenly escaped.
A long climate history lies in north polar cap's layers of dust and sand.
Craters of widely different ages have left their mark on the channel's teardrop islands.
Thick sediments in an ancient crater hint at a long, complex geological history.
Floodwaters breached Holden's walls and left heaps of sediments inside.
NASA may send its next rover here to probe the sediments left by an ancient river.
Ice and debris from countless climatic cycles have all but buried a polar crater.
As subsurface water escaped in Coprates, the ground opened in pits and valleys.
Impacts, floods, and tectonic forces have left scars on this outflow channel.
A deep canyon in the polar cap reveals emerging ancient deposits.
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