Tag Archives: climate change

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

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THEMIS: Pages from the south polar climate history book

THEMIS Image of the Day, February 22, 2017. Today’s VIS image shows part of the south polar cap. It is now summer in the region and the surface frosts are gone. The layers of ice comprising the cap are now … Continue reading

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Early Mars climate changes driven by carbonate – silicate cycle

Dramatic climate cycles on early Mars, triggered by buildup of greenhouse gases, may be the key to understanding how liquid water left its mark on the planet’s surface, according to a team of planetary scientists. Scientists have long debated how … Continue reading

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THEMIS: South polar ice cap layers

THEMIS Image of the Day, October 3, 2016. This VIS image shows some of the multiple layers of ice that make up the South Polar cap. More THEMIS Images of the Day by geological topic.

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Radar finds ice-age record in Mars polar cap

Using radar data collected by NASA’s Mars Reconnaissance Orbiter, a Southwest Research Institute-led team found evidence of an ice age recorded in the polar deposits of Mars. Ice ages on Mars are driven by processes similar to those responsible for … Continue reading

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Giant mounds inside Mars craters were built by winds, climate change

New research has found that wind carved massive mounds of more than a mile high on Mars over billions of years. Their location helps pin down when water on the Red Planet dried up during a global climate change event. … Continue reading

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Explaining valley networks with climate models

The extensive valley networks on the surface of Mars were probably created by running water billions of years ago, but the source of that water is unknown. Now, a team of Penn State and NASA researchers is using climate models … Continue reading

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Ancient Mars was icy and cold

The high seas of Mars may never have existed. According to a new study that looks at two opposite climate scenarios of early Mars, a cold and icy planet billions of years ago better explains water drainage and erosion features … Continue reading

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THEMIS: South polar layers — false color

THEMIS Image of the Day, May 15, 2015. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations … Continue reading

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Gully patterns document Mars climate cycles

Geologists from Brown University have found new evidence that glacier-like ice deposits advanced and retreated multiple times in the midlatitude regions of Mars in the relatively recent past. For the study, in press in the journal Icarus, the researchers looked … Continue reading

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