Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 6, 1965 | public
Journal Article

Mariner IV Photography of Mars: Initial Results


The 22 photographs of Mars taken by Mariner IV have been successfully received on earth. The Martian surface photographed is rather densely populated with impact craters whose sizes range up to at least 120 kilometers in diameter. We infer that the visible Martian surface is extremely old and that neither a dense atmosphere nor oceans have been present on the planet since the cratered surface was formed.

Additional Information

© 1965 American Association for the Advancement of Science. 29 July 1965.

Additional details

August 19, 2023
October 25, 2023