Comet that killed the dinosaurs #toweroflondon

#horseguardsparade #london #metpolice ##thequeensguard #toweroflondon #thekingsguard #windsorcastle Scientists already know that an asteroid—or perhaps a comet—struck Earth off Mexico's Yucatán Peninsula. The resulting 110 miles/80 kilometers wide Chicxulub crater is thought to have caused a decades-long “impact winter” that killed the dinosaurs.