The surface of Mars may appear to be perpetually still, but its many features are ever-changing — as represented in this Mars Express view of the severely eroded Greeley impact crater. This region is thought to be some four billion years old, and is thus home to many features that formed in the very earliest days of the Solar System.
Many craters have formed, changed, and eroded away in Noachis Terra, and Greeley crater is no exception. The subject of these Mars Express images sits between two huge, deep impact basin plains, Argyre and Hellas, and is a great example of a very old crater that has endured significant erosion over time.
Wind, water, ice, and subsequent impacts have all played a part in wearing down the once-fresh structure of the crater. With a depth of only 1. Accompanying views of the crater show it in a wider context on Mars, colour-coded by topography — highlighting the relative depths of the crater, its broken-down wall, smaller superimposed craters, and other features throughout the region — and also via an oblique perspective, which looks across the crater towards the south-west.
Together, these images well-characterise the crater and its environment, and offer an intriguing insight into this ancient region on our planetary neighbour. Greeley crater earned its moniker following a proposal by the International Astronomical Union in to name the crater after distinguished planetary scientist Ronald Greeley.
(mh=f87G1fK1uUyH2Pmj)13.jpg "Teen girls in Greeley")
Greeley passed away on 27 October You have already liked this page, you can only like it once! Mars Express plan view of Greeley Crater Accompanying views of the crater show it in a wider context on Mars, colour-coded by topography — highlighting the relative depths of the crater, its broken-down wall, smaller superimposed craters, and other features throughout the region — and also via an oblique perspective, which looks across the crater towards the south-west.
