The Late Veneer and Earth's habitability

Asteroid impacts were a hazard to any life on the Hadean Earth. A traditional approach to geochemical models of the asteroid impactors uses the concentration of highly siderophile elements including the Pt-group in the silicate Earth. These elements occur in roughly chondritic relative ratios, but with absolute concentrations <1% chondrite. This veneer component implies addition of chondrite-like material with 0.3-0.7% mass of the Earth’s mantle or an equivalent planet-wide thickness of 5-20 km. The veneer thickness, 200-300 m, within the lunar crust and mantle is much less.

Activity Report of the SETI Institute August 2016

With the fall breezes beginning their appearances here in Mountain View, our Summer Interns have gone back to school after impressing us with their summer projects.  However, SETI Institute scientists are still keeping busy.  They continue to unravel more puzzles about our local celestial neighbors as well as other worlds many light-years away.  Every day, researchers at the SETI Institute are expanding both our knowledge and understanding in the quest to find life beyond Earth.