News from Mars: A mile-deep ice crater and marsquakes

By Ashley Strickland, CNN

Updated 1853 GMT (0253 HKT) December 20, 2018

This perspective of Mars' Valles Marineris hemisphere from July 9, 2013, is actually a mosaic comprising 102 Viking Orbiter images. At the center is the Valles Marineris canyon system, over 2,000 kilometers long and up to 8 kilometers deep.