Tag Archives: valley networks

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

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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

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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

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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

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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

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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

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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

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HRSC: Tributes to wetter times on Mars

A dried-out river valley with numerous tributaries is seen in this recent view of the Red Planet captured by ESA’s Mars Express. This section of the Libya Montes region, which sits on the equator at the boundary of the southern … Continue reading

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Impact-heated rock led to relatively recent water-carved valleys on Mars

New research shows that water from melted snow and ice likely carved valley networks around Lyot crater on Mars. Present-day Mars is a frozen desert, colder and more arid than Antarctica, and scientists are fairly sure it’s been that way … Continue reading

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HRSC: Window to a watery past

This 70 km-wide crater and its surrounds offer a window into the watery past of the Red Planet. The scene, captured by ESA’s Mars Express, is a composite of two images taken in March 2007 and February 2017. It focuses … Continue reading

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