From: snguyen@nasamail.nasa.gov (SUY NGUYEN)
Newsgroups: soc.culture.vietnamese
Subject: TIN-TUC
Date: 7 Apr 92 19:55:59 GMT
Reply-To: snguyen@nasamail.nasa.gov
Organization: N/A
Originator: daemon@media.mit.edu



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Posted: Tue, Apr  7, 1992   7:49 AM PDT              Msg: CJJC-1549-1830/20
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To:     SNGUYEN/NASA
Subj:   TIN-TUC 




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MARS OBSERVER MISSION

     NASA has announced the selection of 33 participating
scientists to take part in a wide range of investigations on
the Mars Observer mission.  These scientists will be added
to the current science teams in October 1992 to increase the
range of studies planned for the 2-year global mapping
mission.  Team leaders and interdisciplinary scientists were
selected for Mars Observer in 1986.

      Mars Observer, America's first mission to Mars in more
than 15 years, will be launched from the Kennedy Space
Center, Fla. on September, 1992, by a Titan-III expendable
launch vehicle built by Martin Marietta Corp.  The
spacecraft itself will ride on the new Transfer Orbit Stage
built by Orbital Sciences Corp., which will send the
spacecraft out of Earth orbit on its way to Mars.

      In August 1993, after an 11-month interplanetary
cruise, the spacecraft will reach Mars where it will fire
its on-board engines and enter a nearly polar orbit at an
altitude of 240 miles.  The spacecraft's seven instruments
will record the global characteristics of Mars for slightly
more than a full martian year (687 Earth days) to watch a
full cycle of changes in the martian seasons. By early 1996,
the spacecraft will have returned to Earth more than 600
billion bits of scientific data, more than has been
collected by the nearly two dozen previous missions flown to
Mars by the U.S. and the former U.S.S.R.

     The instruments carried by Mars Observer are a gamma-
ray detector to measure the chemical composition of the
surface; a laser altimeter to measure the shape and
topography of the surface; an infrareddetector to measure
surface mineral composition; a different infrared detector
to measure the composition and behavior of the martian
atmosphere; a magneto-meter to measure the planet's magnetic
field; and a camera to photograph thelandscape at
resolutions ranging from a few kilometers to several meters.
In addition, careful tracking of the spacecraft's radio
signal will make it possi-ble to map the gravity field of
Mars and some features of its atmospheric structure.

      The wide range of Mars Observer science investigations
will focus on solving several mysteries which were revealed
but not settled by earlier U.S.missions to Mars, such as
whether or not Mars has a magnetic field, where the
water has gone and determining the mineral and chemical
composition of martian soil and bedrock.  The information
gathered on the planet's gravitational field, atmospheric
structure and surface topography and properties will be
crucial to future human exploration of Mars.
Newsgroups: soc.culture.vietnamese