Nasa Probe Strikes Comet Tempel 1

US space agency (Nasa) scientists are celebrating after seeing a probe crash into the heart of a comet. The washing machine-sized impactor collided with Comet Tempel 1 at a relative speed of 37,000km/h, throwing up a huge plume of icy debris. The probe’s mothership, the Deep Impact spacecraft, watched the event from a safe distance, sending images to Earth