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Tag Archives: fluvial channels
New geologic map details Reull, Waikato valleys
A new geologic map of part of the ancient Martian highlands produced by Scott C. Mest and David A. Crown of the Planetary Science Institute provides new insights into the planet’s history of water modifying the surface. “This map depicts … Continue reading
Posted in Reports
Tagged channels, fluvial channels, fluvial landforms, geologic maps, Reull Vallis, Waikato Vallis, water
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THEMIS: Kasei Valles islands
THEMIS Image of the Day, June 6, 2014. There are several streamlined islands in this VIS image of Kasei Valles. This image is located near the region where Kasei Valles empties into Chryse Planitia. More THEMIS Images of the Day … Continue reading
Posted in Reports
Tagged Arizona State University, ASU, channels, floods, fluvial channels, fluvial landforms, Kasei Valles, Mars Odyssey, NASA, outflow channels, THEMIS, Thermal Emission Imaging System
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Mars air has been cold, thin for 3.6 billion years
The atmosphere of Mars today, 95% carbon dioxide, is cold and thin, with less than 1% of Earth’s surface pressure. Yet long ago, it must have been dense enough to allow rivers and streams to flow in many areas of … Continue reading
HiRISE image: sinuous ridges and meanders
These ridges are thought to be old river channels, but wind erosion has created inverted topography. What was low (the channel bottoms) was more resistant to erosion, so now it is relatively high. In a closeup image, we see a … Continue reading
Well-rounded pebbles in Gale Crater’s rocks point to longtime stream flow
Mars Science Laboratory rover Curiosity landed in Gale Crater at a feature called Bradbury Rise, which lies near the far end of the Peace Vallis alluvial fan. The fan is a broad, flat deposit of sand, gravel, and pebbles washed … Continue reading
Posted in Reports
Tagged Aeolis Mons, alluvial fans, Bradbury Rise, climate change, conglomerate rocks, Curiosity, fluvial channels, Gale Crater, Goulburn, gravel, Hottah, Link, Mars Pathfinder, Mount Sharp, outcrops, Peace Vallis, pebbles, streambeds, water
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Aeolis Serpens, Mars’ longest sinuous ridge, is an ancient riverbed
A linear ridge that winds for more than 200 kilometers (120 miles) through part of South Australia was a river channel roughly 10 million years ago. After the paleoriver stopped flowing, silica-rich groundwater seeped into the riverbed, cementing its sediments.
Posted in Reports
Tagged Aeolis Dorsa, Aeolis Serpens, climate, CTX, fluvial channels, fluvial landforms, groundwater, HiRISE, Medusae Fossae Formation, sinuous ridge, water
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‘Faint young Sun paradox’ a problem for Mars (and Earth, too)
Astronomers say that billions of years ago when the Sun was young, it shone with only 70 percent its current brightness, notes Robert Craddock (Smithsonian Institution). If that were true of today’s Sun,
Posted in Reports
Tagged atmosphere, climate, climate change, faint young Sun paradox, fluvial channels, Kepler Observatory, LPSC 2013, valley networks, water, wind
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