This feature could easily be mistaken for a tree stump with characteristic concentric rings. It's actually an impressive birds-eye view into an ice-rich impact crater on Mars. Tree rings provide snapshots of Earth's past climate and, although formed in a very different way, the patterns inside this crater reveal details of the Red Planet's history, too.

The image was taken by the CaSSIS camera onboard the ESA/Roscosmos ExoMars Trace Gas Orbiter (TGO) on 13 June 2021 in the vast northern plains of Acidalia Planitia, centred at 51.9N/326.7E.

The interior of the crater is filled with deposits that are probably water-ice rich. It is thought that these deposits were laid down during an earlier time in Mars' history when the inclination of the planet's spin axis allowed water-ice deposits to form at lower latitudes than it does today. Just like on Earth, Mars' tilt gives rises to seasons, but unlike Earth its tilt has changed dramatically over long periods of time.

One of the notable features in the crater deposits is the presence of quasi-circular and polygonal patterns of fractures. These features are likely a result of seasonal changes in temperature that cause cycles of expansion and contraction of the ice-rich material, eventually leading to the development of fractures.

Understanding the history of water on Mars and if this once allowed life to flourish is at the heart of ESA's ExoMars missions. TGO arrived at Mars in 2016 and began its full science mission in 2018.

The spacecraft is not only returning spectacular images, but also providing the best ever inventory of the planet's atmospheric gases with a particular emphasis on geologically and biologically important gases, and mapping the planet's surface for water-rich locations.

It will also provide data relay services for the second ExoMars mission comprising the Rosalind Franklin rover and Kazachok platform, when it arrives on Mars in 2023. The rover will explore a region of Mars thought once to have hosted an ancient ocean, and will search underground for signs of life.

Related Links
ExoMars Trace Gas Orbiter at ESA
Mars News and Information at MarsDaily.com
Lunar Dreams and more

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Island in a lake of lava - the Martian volcano Jovis Tholus
Berlin, Germany (SPX) Jan 27, 2022
These images, created using data acquired by the High Resolution Stereo Camera (HRSC) on board ESA's Mars Express orbiter, show the Jovis Tholus volcano and various other landscape features, such as tectonic faults, impact craters and solidified lava flows, in the Tharsis region of Mars. The Tharsis uplift, which is several kilometres high, was one of the most active volcanic regions near the Martian equator. With a diameter of almost 4000 kilometres, this plateau is almost as large as Europe. Most Mart ... read more