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Online Praxis 1996 April
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OP4_96.ISO
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venmap.txt
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1996-02-22
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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
PHOTO CAPTION P-45187
March 16, 1995
This image is a composite of the complete radar image collection
obtained by the Magellan mission. The Magellan spacecraft was
launched aboard space shuttle Atlantis in May 1989 and began
mapping the surface of Venus in September 1990. The spacecraft
continued to orbit Venus for four years, returning high-
resolution images, altimetry, thermal emissions and gravity maps
of 98 percent of the surface. Magellan spacecraft operations
ended on October 12, 1994, when the radio contact was lost with
the spacecraft during its controlled descent into the deeper
portions of the Venusian atmosphere. Venus is displayed in this
simple cylindrical map of the planet's surface. The right and
left edges of the image are at 240 degrees east longitude. The
top and bottom of the image are at 90 degrees north latitude and
90 degrees south latitude, respectively. Magellan synthetic
aperture radar mosaics are mapped onto a rectangular latitude-
longitude grid to create this image. Data gaps are filled with
Pioneer-Venus Orbiter altimetric data, or a constant mid-range
value. Simulated color is used to enhance small-scale structure.
The simulated hues are based on color images recorded by the
Soviet Venera 13 and 14 spacecraft. At the top, left of center,
the bright region is Maxwell Montes, the highest mountain range
on Venus. Extending along the equator to the right of center is
Aphrodite Terra, a large highland region on Venus. The scattered
dark patches in this image are halos surrounding some of the
younger impact craters. This global data set reveals a number of
craters consistent with an average Venus surface age of 300
million to 500 million years. The image was produced by the
Solar System Visualization Project and the Magellan science team
at the Jet Propulsion Laboratory'Æs Multimission Image Processing
Laboratory.
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