Tag Archives: valley networks

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 , , , , , , | Comments Off

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 , , , , , , | Comments Off

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

Posted in Reports | Tagged , , , | Comments Off

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 , , , , | Comments Off

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

Posted in Reports | Tagged , , , | Comments Off

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

Posted in Reports | Tagged , , , , , , , , , | Comments Off

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

Posted in Reports | Tagged , , , | Comments Off

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

Posted in Reports | Tagged , , , , , , , , , , , , , | Comments Off

Valley networks point to much wetter past

A new study led by Northern Illinois University geography professor Wei Luo calculates the amount of water needed to carve the ancient network of valleys on Mars and concludes the Red Planet’s surface was once much more watery than previously … Continue reading

Posted in Reports | Tagged , , , | Comments Off

How hard did it rain on Mars?

Heavy rain on Mars reshaped the planet’s impact craters and carved out river-like channels in its surface billions of years ago, according to a new study published in Icarus. In the paper, researchers from the Smithsonian Institution and the Johns … Continue reading

Posted in Reports | Tagged , , , | Comments Off