Results by Neukum et al.(2001) and Ivanov (2001) are combined with crater counts to
estimate ages of Martian surfaces. These results are combined with studies of Martian …

This paper reviews and refines the technique of dating martian surfaces by using impact-
crater isochrons (defined as size distributions of impact craters on undisturbed martian …

It has been 10 years since publication of the first edition ofSoils of the Past. In that time the
subject of paleopedology hasgrown rapidly, and established itself within the mainstream …

The Mars Orbiter Laser Altimeter (MOLA), an instrument on the Mars Global Surveyor
spacecraft, has measured the topography, surface roughness, and 1.064‐μm reflectivity of …

More than 3 years of high‐resolution (1.5–20 m/pixel) photographic observations of the
surface of Mars have dramatically changed our view of that planet. Among the most …

Layered and massive outcrops on Mars, some as thick as 4 kilometers, display the
geomorphic attributes and stratigraphic relations of sedimentary rock. Repeated beds in …

Valley networks provide compelling evidence that past geologic processes on Mars were
different than those seen today. The generally accepted paradigm is that these features …

Over the past 30 years, the water-generated landforms and landscapes of Mars have been
revealed in increasing detail by a succession of spacecraft missions. Recent data from the …

Ground ice in the crust and soil may be one of the largest reservoirs of water on Mars,,. Near-
surface ground ice is predicted to be stable at latitudes higher than 40°(ref.), where a …

A photon in an arbitrary polarization state cannot be cloned perfectly 1, 2. But suppose that
at our disposal we have several copies of a photon in an unknown state. Is it possible to …