Evidence for recent groundwater seepage and surface runoff on Mars.

  title={Evidence for recent groundwater seepage and surface runoff on Mars.},
  author={Michael C. Malin and Kenneth S. Edgett},
  volume={288 5475},
Relatively young landforms on Mars, seen in high-resolution images acquired by the Mars Global Surveyor Mars Orbiter Camera since March 1999, suggest the presence of sources of liquid water at shallow depths beneath the martian surface. Found at middle and high martian latitudes (particularly in the southern hemisphere), gullies within the walls of a very small number of impact craters, south polar pits, and two of the larger martian valleys display geomorphic features that can be explained by… 

Changes on the Surface of Mars Resulting from Inner Factors and Impactors

Images of the Martian surface transmitted to Earth by the Mars Global Surveyor spacecraft were recently interpreted as evidence of the presence of liquid water (Malin & Edgett, 2000). This finding

Formation of Recent Martian Debris Flows by Melting of Near-Surface Ground Ice at High Obliquity

It is shown that these gullies on Mars may result from the melting of water ice in the top few meters of the martian subsurface at high obliquity, and that above-freezing temperatures can occur in the near surface of Mars, but are only predicted at latitudes and for slope orientations corresponding to where the gullies have been observed on Mars.

Liquid Surface Water Polygonal Terrain: Implications for

Images from the Mars Orbiter Camera (MOC) through August 1999 were analyzed for the global distribution of small-scale polygonal terrain not clearly resolved in Viking Orbiter imagery. With very few

Evidence of liquid water in recent debris avalanche on Mars

The identification of landforms associated to liquid water on Mars is a major goal for the understanding of the geologic and climatic evolution of this planet. In the region of Reull Vallis, near

Small‐scale Martian polygonal terrain: Implications for liquid surface water

Images from the Mars Orbiter Camera (MOC) through August 1999 were analyzed for the global distribution of small‐scale polygonal terrain not clearly resolved in Viking Orbiter imagery. With very few

An equatorial periglacial landscape on Mars

Debris flows and water tracks in northern Victoria Land, continental East Antarctica: a new terrestrial analogue site for gullies and recurrent slope lineae on Mars

Abstract Although the present environmental conditions on Mars prohibit the generation of significant volumes of liquid water, observations of several very young landforms, such as gullies and



The Surface of Mars

Mariner 6 and 7 pictures show that craters are the dominant landform on Mars and that their occurrence is not correlated uniquely with latitude, elevation, or albedo markings. Two distinct

General geology and geomorphology of the Mars Pathfinder landing site

The Mars Pathfinder (MPF) spacecraft landed on relatively young (late Hesperian-early Amazonian; 3.1–0.7 Ga) plains in Chryse Planitia near the mouth of Ares Vallis. Images returned from the

Groundwater formation of martian valleys

High-resolution images of martian valleys are presented that support the view that ground water played an important role in their formation, although the authors are unable as yet to establish when this occurred.

New views of Mars eolian activity, materials, and surface properties : Three vignettes from the Mars Global Surveyor Mars Orbiter Camera

Prior to the Mars Global Surveyor (MGS) mission, a very general view had emerged in which Martian surface materials were seen as consisting of a mixture of bright dust, dark sand, and rocks. The

Overview of the Mars Pathfinder mission and assessment of landing site predictions.

Remote-sensing data at a scale of generally greater than approximately 1 kilometer and an Earth analog correctly predicted a rocky plain safe for landing and roving with a variety of rocks deposited by catastrophic floods that are relatively dust-free.

Results from the Mars Pathfinder camera.

Images of the martian surface returned by the Imager for Mars Pathfinder (IMP) show a complex surface of ridges and troughs covered by rocks that have been transported and modified by fluvial,

Climatic Change on Mars

The equatorial sinuous channels on Mars detected by Mariner 9 point to a past epoch of higher pressures and abundant liquid water, which implies that epochs of much higher and of much lower pressure must have characterized martian history.

Channels on Mars

By showing that parts of equatorial and mid-latitudinal Mars have a variety of channels and channel-like forms, Mariner 9 photographs provide a basis for speculations concerning surface processes,

Classification and time of formation of Martian channels based on Viking data

Fluviatile and volcanic Martian channels, first discovered on Mariner 9 pictures, have been reexamined by using Viking orbital photography. The superior discrimination of the Viking photographs,