title: Caddeymo cusub ayaa muujinaya sida daruuraha boodhka ah ee asteroid ay u suurto gashay in ay nolol cusub ku abuuraan dhulka 470 milyan oo sano ka hor
abstract: Isotope-ka laga helay sediment-ka badda hoosteeda waxay tilmaamaysaa isku dhaca meelaha qorraxda ee u dhow Mars, daraasad ayaa soo jeedinaysa