A big splash! – water and the giant impact

It is now widely accepted that the Moon formed as the result of a collision between two planet-sized objects. An event generally referred to as the giant impact. But that’s more or less where the consensus ends. There is currently little agreement on the relative size of the colliding bodies or the energy of the…

In the Arctic heading for Antarctica

Some very positive news on the BBC website last week concerning the project to find buried iron meteorites in Antarctica. The team, led by Geoff Evatt of the University of Manchester, have been testing their detection equipment at the Ny-Alesund research base in Svalbard. It sounds as if real progress has been made and all…

Earth’s doppelganger

A new paper in Nature presents some very interesting ideas about the evolution of the inner Solar System and by implication the nature of the bodies that collided in the giant impact to form the Earth-Moon system. Martin Schiller, Martin Bizzarro and Vera Assis Fernandes have looked at the calcium isotope composition of various inner…