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1993-05-03
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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
FOR IMMEDIATE RELEASE Oct. 2, 1989
A five-mile-tall, geyser-like plume of dark
material has been discovered erupting from the surface of
Neptune's moon Triton in one of the images returned last
month to the Jet Propulsion Laboratory, Pasadena, Calif., by
NASA's Voyager 2 spacecraft.
The discovery comes just as the Neptune encounter
-- Voyager 2's fourth and final planetary flyby in 12 years
-- officially ends today (Oct. 2).
This is the first time geyser-like phenomena have
been seen on any solar system object (other than Earth) since
Voyager discovered eight active geysers shooting sulfur above
the surface of Jupiter's moon, Io. The new finding --
Voyager's last hurrah in its journey past the planets --
augments Triton's emerging reputation as the most perplexing
of all the dozens of moons Voyager 1 and 2 have explored.
Voyager's camera captured the eruption shooting
dark particles high into Triton's thin atmosphere on August
24 from a distance of 99,920 kilometers (about 62,000 miles).
Resembling a smokestack, the narrow stem of the
dark plume, measured using stereo images, rises vertically
nearly eight kilometers (five miles), forming a cloud that
drifts 150 kilometers (90 miles) westward in Triton's winds.
The feature was recognized by examining several
images taken from different angles and analyzed through
stereoscopic techniques.
While Voyager scientists are still trying to
determine the mechanism responsible for the eruption, one
possibility being considered is that pressurized gas,
probably nitrogen, rises from beneath the surface and
carries aloft dark particles and possibly ice crystals.
Whatever the cause, the plume takes the particles to an
altitude where they are left suspended to form a cloud that
drifts westward.
Voyager 2's working life among the planets may be
at an end, but the spacecraft and its twin, Voyager 1, are
expected to continue returning information about the various
fields and particles they encounter while approaching, and
eventually crossing, the boundary of our solar system. The
plutonium-based generators that provide electricity to the
spacecraft are expected to keep alive the computers, science
instruments and radio transmitter for up to 25 or 30 more
years.
As of today, the long-lived project will be known
as the Voyager Interstellar Mission.
The Voyager Project is managed for NASA's Office of
Space Science by the Jet Propulsion Laboratory, Pasadena,
Calif.
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10/2/89
#1267 MBM