Introduction: The Bosumtwi crater has a diameter of 10.5 km and is located in the center of Ghana in West Africa (6o 30’ N and 1o 25’ W). Its age is 1.05 Ma and it forms a well preserved impact structure with a well defined rim. Its center is occupied by the closed basin of Lake Bosumtwi. The target rock is essentially composed of Proterozoic (2.1 to 2.2 Ga) units of the Birimian Supergroup tha...

[1] Observations of fresh impact craters by the Opportunity rover and in high‐resolution orbital images constrain the latest phase of granule ripple migration at Meridiani Planum to have occurred between ∼50 ka and ∼200 ka. Opportunity explored the fresh Resolution crater cluster and Concepción crater that are superposed on and thus younger than the ripples. These fresh craters have small dark ...

a r t i c l e i n f o a b s t r a c t At martian mid-to-high latitudes, the surfaces of potentially ice-rich features, including concentric crater fill, lobate debris aprons, and lineated valley fill, typically display a complex texture known as " brain terrain, " due to its resemblance to the complex patterns on brain surfaces. In order to determine the structure and developmental history of c...

Introduction: Scaling relations derived from laboratory experiments and dimensional analysis [1] provide first-order estimates for the diameters of objects responsible for craters on the planets. At basin scales, however, the final crater rim may not be preserved due to rim collapse. Assumptions about impactor speed, angle, and density further preclude a unique determinations. As a result, the ...

Introduction: The GRAIL (Gravity Recovery and Interior Laboratory [1]) mission has enabled unprecedented views of the lunar crust and interior structure. Indeed, the data solutions now resolve gravity anomalies arising from lateral heterogeneities within the crust globally at scales < 10 km[2,3]. Intrusive magmatic features such as dikes and sills are predicted to be prevalent within the lunar ...

Introduction: Recent impact craters on the Moon, Mercury, and icy Galilean satellites have produced bright rays extending hundreds or thousands of kilometers from the crater rims. A large rayed crater has never previously been seen on Mars, and it has been assumed that the active aeolian environment would quickly remove the ephemeral ray material [1]. Here we report the discovery of a 10-km dia...

The new, global catalog of 75,919 impact craters on Mars has been compiled entirely by a computer algorithm. Using crater depths listed by the new catalog global maps of depth/diameter ratio are created. The global pattern of crater depths is consistent with the existence of the cryosphere at depths that decrease toward the poles. Introduction: If left to traditional manual surveys, the fractio...

1 The Deep Impact Discovery Mission M. F. A’Hearn , L.A. McFadden, C.M. Lisse, D.D. Wellnitz (U.Md), M.J.S. Belton, (Belton Space Initiatives), A. Delamere (Ball Aerospace and Technologies Corp), K.P. Klaasen (JPL), J.Kissel (MPI), K.J. Meech (U.Hawaii), H.J. Melosh (U. Arizona), P.H. Schultz (Brown U.), J.M. Sunshine (SAIC), J. Veverka (Cornell U.), and D.K. Yeomans (JPL) The Deep Impact missi...

[1] Several domes indicative of non-mare volcanism, morphologically as well as spectrally distinct from surrounding mare and highland units, are located in the Gruithuisen region in northern Oceanus Procellarum. The determination of the nature and age of non-mare volcanism helps to put constraints on lunar crustal evolution. The ages of the domes were previously thought to be mid-Imbrian or pos...

Introduction: The transition zone between Elysium and Utopia is a highly complex area, characterized by Galaxias Chaos along the northern boundary and huge outflow channels dominating the northwestern part. Several very enigmatic morphologies are observed including some very distinctive crater morphologies [1], having bipartite crater ejecta consisting of an inner pattern of breached folds clos...