"We've got the black holes cornered, " said Daniel Stern of Nasa's Jet Propulsion Laboratory (JPL), lead author of one of the three studies presented on Wednesday.
In a third study published in Nature, Jeffrey Andrews-Hanna and Maria Zuber of the Massachusetts Institute of Technology (MIT) in Cambridge, and Bruce Banerdt of Nasa's Jet Propulsion Laboratory (JPL) in California, provide impact evidence from gravitational and topographical signatures on Mars.