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- Besides the Mariner 4, several other
- U.S. spacecraft have visited the red
- planet. In 1969, weeks after the
- first moon landing Mariners 6 and
- 7 flew by taking hundreds of sharp
- detailed images. Mariner 9 in
- 1971 which was the first manned
- made object to orbit another
- planet, and the Viking 1 and
- 2 missions which sent landers
- to the surface.
-
- This is section of the 2500
- mile long Valles Marineris.
- This portion is 12 miles wide
- and several miles deep. It makes
- the Grand Canyon suddenly less
- grand.
-