A meteorite trail is seen above a residential apartment block in the Urals city of Chelyabinsk, on February 15th. A heavy meteor shower rained down on central Russia, sowing panic as the hurtling space debris smashed windows and injured dozens of stunned locals. Photograph: Oleg Kargopolov/AFP/Getty Images

Astronomer Alan Fitzsimmons has a lot on his mind. He is interested in our solar system, but also in how to save planet Earth. The Queen’s University (...)