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.
The Known Universe takes viewers from the Himalayas through our atmosphere and the inky black of space to the afterglow of the Big Bang. Every star, planet, and quasar seen in the film is possible because of the world's most complete four-dimensional map of the universe, the Digital Universe Atlas that is maintained and updated by astrophysicists at the American Museum of Natural History. The new film, created by the Museum, is part of an exhibition, Visions of the Cosmos: From the Milky Ocean to an Evolving Universe, at the Rubin Museum of Art in Manhattan through May 2010.
Canadian scientist Willard S. Boyle received the Nobel for physics Thursday, a prize he's sharing with two other physicists honoured for their work in optics.
Newly discovered Alcor B orbits its larger sibling and was caught in the act with an innovative technique called "common parallactic motion" by members of Project 1640, an international collaborative team that includes astrophysicists at the American Museum of Natural History, the University of Cambridge's Institute of Astronomy, the California Institute of Technology, and NASA's Jet Propulsion Laboratory.
"The European Organization for Nuclear Research (CERN) says it expects to restart the Large Hadron Collider (LHC) by this weekend after more than a year of repairs."