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Tag Archives: valley networks
HiRISE: Melas Chasma valleys
Valleys in Melas Chasma. Caption throwback (2008): The interpretation is that the valleys formed by precipitation in the late Hesperian epoch and the water that formed them collected in the basin to produce a lake where sediment was deposited. This … Continue reading
Posted in Reports
Tagged High Resolution Imaging Science Experiment, HiPOD, HiRISE, HiRISE Picture of the Day, Mars Reconnaissance Orbiter, Melas Chasma, MRO, NASA, rainfall, University of Arizona, valley networks, valleys
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Mars Express: Dark meets light in Terra Cimmeria
ESA’s Mars Express has captured the cosmic contrast of Terra Cimmeria, a region in the southern highlands of Mars marked by impact craters, water-carved valleys, and sand and dust in numerous chocolate and caramel hues. Mars is often referred to … Continue reading
Posted in Reports
Tagged basaltic sand, DLR, dust, ESA, European Space Agency, FU Berlin, High Resolution Stereo Camera, HRSC, Mars Express, MEX, Terra Cimmeria, valley networks
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HiRISE: Valleys in a crater north of Sacra Sulci
Valleys in a crater to the north of Sacra Sulci. Small valleys similar to these have been dated to the Hesperian and Amazonian epochs in other areas of Mars, making them some of the youngest features formed by the flow … Continue reading
Posted in Reports
Tagged High Resolution Imaging Science Experiment, HiPOD, HiRISE, HiRISE Picture of the Day, Mars Reconnaissance Orbiter, MRO, NASA, Sacra Sulci, University of Arizona, valley networks, valleys
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Rivers raged on Mars late into its history
Long ago on Mars, water carved deep riverbeds into the planet’s surface — but we still don’t know what kind of weather fed them. Scientists aren’t sure, because their understanding of the Martian climate billions of years ago remains incomplete. … Continue reading
Posted in Reports
Tagged Curiosity, fluvial channels, fluvial erosion, fluvial landforms, fluvial processes, Gale Crater, Mars Science Laboratory, MSL, valley networks
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Mars Express: Signs of ancient flowing water
These images from ESA’s Mars Express satellite show a branching, desiccated system of trenches and valleys, signs of ancient water flow that hint at a warmer, wetter past for the Red Planet. We see Mars as a cold, dry world, … Continue reading
Posted in Reports
Tagged DLR, ESA, European Space Agency, fluvial channels, fluvial landforms, FU Berlin, High Resolution Stereo Camera, HRSC, Mars Express, MEX, valley networks
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Early Mars: Arid, with occasional snow or rain
[Editor’s note: From a paper by Yo Matsubara, Alan Howard, and Ross Irwin recently published in the Journal of Geophysical Research.] Constraints on the Noachian paleoclimate of the martian highlands from landscape evolution modeling Evidences show that Mars was once wetter … Continue reading
Posted in Reports
Tagged climate, climate change, Noachis Terra, rain, snow, Terra Cimmeria, valley networks
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Valley network distribution supports true polar wander and an ancient ocean
[Editor’s note: From a paper by Ngai Ham Chan and three co-authors recently published in the Journal of Geophysical Research.] New Evidence of an Ancient Martian Ocean from the Global Distribution of Valley Networks • Surface deformation due to True … Continue reading
Posted in Reports
Tagged deltas, oceans, sediments, shorelines, TPW, true polar wander, valley networks
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Mars valley networks traced to heavy rainfall
Astonishingly similar: valley networks on Mars bear a strong resemblance to those in terrestrial arid landscapes. Researchers have been able to demonstrate this using the angles of river valley branches. From this, they infer that Mars had a primeval climate … Continue reading
Warmer, wetter early Mars: a geological and climatological case
The climate of early Mars is a subject of debate. While it has been thought that Mars had a warm and wet climate, like Earth, other researchers suggested early Mars might have been largely glaciated. A recent study by Ramses … Continue reading
Posted in Reports
Tagged climate change, climate cycles, glaciers, ice, valley networks
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How water could flow on icy early Mars
Research by planetary scientists at Brown University finds that periodic melting of ice sheets on a cold early Mars would have created enough water to carve the ancient valleys and lakebeds seen on the planet today. For scientists trying to … Continue reading