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Spacecraft Rosetta Roused From Slumber On Comet-Chasing Quest


By Maria Sheahan

FRANKFURT, Jan 20 (Reuters) - Comet-chasing spacecraft Rosetta woke from nearly three years of hibernation on Monday to complete a decade-long deep space mission that scientists hope will help unlock some of the secrets of the solar system.

Rosetta, which was launched by the European Space Agency (ESA) in 2004, is due to rendezvous with comet 67P/Churyumov-Gerasimenko and land a probe on it this year in an unprecedented manoeuvre.

Scientists hope data the probe gathers will allow them to peek into a kind of astronomical time capsule that has preserved for millions of years clues as to what the world looked like when our solar system was born.

"Since comets are so primitive, they can give scientists a chance to understand how the solar system formed, where it came from," Rosetta spacecraft operations manager Andrea Accomazzo told Reuters ahead of the wake-up call.

On its way to the comet, a roughly 3 by 5 km-large rock discovered in 1969, Rosetta has been circling the sun on a widening spiral course, swinging past Earth and Mars to pick up speed and adjust its trajectory.

The mission will perform several historical firsts, including the first time a spacecraft orbits a comet rather than just whizzing by it to snap some fly-by pictures, and the first time a probe has landed on a comet's nucleus.

Rosetta is also the first mission to venture beyond the main asteroid belt relying solely on solar cells for power generation, which is also why it had to be put into a deep sleep for 957 days.