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Space
probe lands on Titan
Scientists
announced success this morning in their mission to land a probe on Titan, a moon
of Saturn that is of particular interest because its chemistry may resemble the
chemistry of life.
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.
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
European-built probe, called Huygens, made its descent as 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 is the first to explore
the Saturn system of rings and moons from orbit. Cassini began orbiting Saturn
on June 30.
Huygens
was released from Cassini on Dec. 25 and later through Titan's atmosphere,
collecting data as the 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.
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.