This time next year, ESA’s Huygens spaceprobe will be descending through the
atmosphere of Saturn’s largest moon, becoming the first spacecraft to land on a
body in the outer Solar System.

Earlier this month, the giant ringed planet Saturn was closer to Earth than it
be for the next thirty years. All the planets orbit the Sun as if on a giant
racetrack, travelling in the same direction but in different lanes.

Those in the outer lanes have further to travel than those on the inside lanes.
Earth regularly "laps" the further planets. On New Year’s Eve 2003, Earth
overtook Saturn, drawing closer than at any time in the next three decades.

Through a small telescope, Saturn is normally visible as a creamy yellow "star".
You may be able to see the ring system that the planet is famous for, and its
largest moon Titan will show up as a tiny dot of light.

That tiny dot is the destination for ESA"s Huygens probe and may hold
vital clues about how life began on Earth. Titan is the only moon with a
thick atmosphere in the Solar System.

Astronomers think this atmosphere might closely match the one Earth
possessed millions of years ago, before life began. Certainly Titan’s
atmosphere is rich in carbon, the chemical necessary for life on Earth.
What is more, this is all stored in "deep freeze", ten times further from
the Sun than the Earth.

The big mystery is Titan’s surface, which is hidden by a cloud layer. This is
ESA built Huygens, to probe through this layer which is impenetrable by
Earth-based observations.

In January 2005, Huygens will parachute below the clouds to see what is really
going on. Its battery of instruments will return over 1000 images as it floats
down and samples the chemistry of this exotic place.

The Titan probe was named Huygens in honour of the Dutch astronomer who
discovered Titan in 1655. Launched in October 1997, Huygens is currently in
space, hitching a ride on NASA’s Cassini spacecraft.

So look forward to seeing more of Saturn and a tiny European spacecraft called
Huygens, that in one year’s time will make an historic landing in the quest to
uncover the origins of life.