<p>HorizongoesbehindthescenesatNASAastheycountdowntothelandingofa2.5billion-dollarroveronthesurfaceofMars.Insixdaystime,thenuclear-poweredvehicle-thesizeofacar-willbewincheddownontothesurfaceoftheRedPlanetfromarocket-poweredcrane.That'sifthingsgoaccordingtoplan:MarshasbecomeknownastheBermudaTriangleofspacebecause...</p>
