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1993-04-21
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Ton, may be photographed when Mariner's cameras and other
scientific instruments are reactivated in June.
The Martian North Polar region had been in its winter
season and shrouded by clouds throughout earlier parts of the
mission. However, a seasonal change has occurred on Mars and
this cloud cover will disperse during the Martian spring in the
Northern Hemisphere to allow mapping of the surface. At the
time of the last pictures taken before solar occultation,
Mariner 9's instruments detected the first faint signs of a
cloud cover beginning to form over the South Pole with the fall
season in the Southern Hemisphere.
Science team members have assembled enough data to
revise a pre-Mariner 9 consensus that Mars was a planetary
fossil. Mars, it now appears, may still be an active planet.
From an orbit swinging to within 1,640 kilometers
(1,025 miles) of the planet twice a day, Mariner 9's two
television cameras have taken spectacular pictures of canyon
areas wider and deeper than the Grand Canyon and a volcanic
crater system with one volcanic pile larger than any on Earth.
This giant crater, Nix Olympica (Snows of Olympus), is 496
kilometers (310 miles) across at its base and stands some
125,000 meters (38,000 feet) above the surrounding terrain.
Some features seen in many pictures appear to be the result of
water erosion and there are indications that there may be a
large quantity of water on Mars, (in the form of ice) than
previously supposed.
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5/26/72 #617 \