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Space probe lands on Titan
Posted Jan. 14, 2005
Special to World Science
New images from a space probe that just landed on a
mysterious moon of Saturn show what look like shorelines and drainage channels,
researchers said. The revelations were a delight to scientists studying the object,
which is thought to harbor chemicals similar to those that covered Earth at life's
dawn.
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One of
the first, unprocessed images from the European Space Agency's Huygens
probe as it descended to Saturn's moon Titan. It was taken with the
Descent Imager/Spectral Radiometer, one of two NASA instruments on the
probe.
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“These
are extraordinary images. I never thought I would see something like this even
in my wildest dreams,” said Claudio Solazzo, mission operations manager for the
European Space Agency.
The
European-built probe, Huygens, landed this morning on Titan, one of
Saturn's 33 moons. The probe snapped the pictures from 16 kilometers (10 miles)
above the Titan’s surface. Agency officials said they have about 350 images so
far.
Other
space agency officials remarked that the moon shows an extent of complexity and
dynamicism rivaled by few other Solar System objects.
Bigger
than the planets Mercury and Pluto, Titan is one of the few moons in our solar
system with its own atmosphere. The moon is cloaked in a thick, smog-like haze
that scientists believe may be very similar to Earth's before life began more
than 3.8 billion years ago.
There
was no immediate word on what the apparent shorelines might be, nor what sort of
ocean they might represent. Some scientists have speculated Titan may have
oceans of methane. Methane is a substance that on Earth is a colorless, odorless gas,
produced when living things decompose, and commonly used
as a fuel.
Further
study of this moon promises to reveal much about planetary formation and,
perhaps, about the early days of Earth as well, scientists believe.
The
probe's descent was the last phase in a seven-year journey strapped to the
Cassini Orbiter, a spacecraft built as a collaboration among 17 nations. The
Cassini spacecraft, the first to orbit the Saturn system of rings and moons,
began its orbit on June 30. Huygens was released from Cassini on Dec. 25 and
later dropped through Titan's atmosphere, collecting data as parachutes
slowed it from super sonic speeds.
The
probe carries six instruments designed to study the content and movements of
Titan's atmosphere and collect data and images on the surface. It sends data and
images to the Cassini mothership, which relays them to Earth.
The
probe began transmitting data to Cassini four minutes into its descent and
continued to transmit data after landing at least as long as Cassini was above
Titan's horizon. The first confirmation that Huygens was alive came this morning
when the Green Bank radio telescope in West Virginia, USA, picked up a faint but
unmistakable radio signal from the probe.
Radio
telescopes on Earth continued to receive this signal well past the expected
lifetime of Huygens. It was expected to last only about half an hour in the
moon’s harsh climate, researchers said, but it went on working for at least
two hours.
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