The Earth and Moon

Zircon from the Moon , Earth and Mars

The Oldest Earth and Moon Rocks

Introduction: We describe a project that could greatly alter our understanding of the environment on Earth at the time in which life originated. The approach is to systematically search for terrestrial rock and mineral samples that should be present on the lunar surface due to impacts, and in selected terrestrial localities. Project activities include studies of terrestrial materials, developme...

Ringel’s Generalized Earth-moon Problem

A graph G has surface thickness n (S-thickness n) with respect to the surface S, if G can be decomposed into n and no fewer subgraphs by making n copies of the vertex set of G and then assigning each edge of G to one of the n copies so that n graphs result; each resulting subgraph of G must be S embeddable. The chromatic number of a graph G, denoted χ(G), is simply the fewest number of colors n...

Dynamical evolution of the Earth-Moon Progenitors

The origin of Earth's Moon has been a perplexing mystery for many decades. Lunar samples have been obtained indicating an age of the Moon to be roughly 60-120 Myr [1,2] younger than the Calcium Aluminum Inclusions in the chondritic meteorites. Updated measurements indicate an age difference of 70-110 Myr [3,4]. Additional information has been obtained for the composition of the Moon relative to...

Stromatolites and Earth--sun--moon Dynamics

Vanyo, J.P. and Awramik, S.M., 1985. Stromatolites and Earth--Sun--Moon dynamics. Precambrian Res., 29 : 121--142. Inclination of stromatolite columns, caused by nonvertical direction of averaged incident solar radiation, provides a signal for deducing astronomical and geophysical data at time of stromatolite formation. A sample of Anabaria juvensis (Bitter Springs Formation, central Australia)...