Dark halos produced by current impact cratering on Mars

Global Dispersion of Dust following Impact Cratering Events on Mars

Cho, S. T. Stewart, and M. I. Richardson. Carnegie Institution of Washington (Department of Terrestrial Magnetism, 5241 Broad Branch Road, N.W., Washington, D.C. 20015, [email protected]), Harvard University (Department of Earth and Planetary Sciences, 20 Oxford St., Cambridge, MA 02138, [email protected]), California Institute of Technology (Division of Geological and Planetary Sciences,...

Secondary Cratering and Age Determination on Mars

Introduction: The discovery of a secondary-crater strewn field generated by the 10-km crater Zunil [1] stirred up a discussion of what is the real shape of the primary production crater size-frequency distribution and if age determination based on craters in the smaller-crater size range is possible. The main point of the discussion is whether or not the steep branch (below about 1 km diameter)...

Phyllosilicates Produced by Impact-generated Hydrothermal Systems on Mars

On Singular Dark Matter Halos

The distribution of dark matter around galactic or cluster halos has usually been assumed to be approximately isothermal with a non-zero core radius, which is expected to be of the order of the size of the visible matter distribution. Recently, the possibility has been raised that dark matter halos might be singular in the sense that the dark matter density could increase monotonically with rad...

Orientation of valley networks on Mars: The role of impact cratering

[1] We compare, on a global scale, the degree of correlation between orientation of stream networks and topographic aspect on Mars and Earth. The orientation of streams on Earth is a reflection of local, underlying geology but, in general, it correlates with regional topographic aspect. However, the orientation of valley networks, prominent features on Mars, thought to be fossils of ancient str...