Science news highlights of 2009

It was the year we learned of a spectacular smash-up in space, and scientists working on the world's biggest physics experiment delighted at collisions of an entirely different sort.
There were shockwaves, too, in Copenhagen, as the summit failed to reach a consensus on tackling climate change, instead merely noting a deal struck by major powers including the US and China.
The BBC's science reporter Paul Rincon looks back at the twists and turns of a year in science and the environment.

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