There has been an alert on board the International Space Station. The three astronauts on board were forced to evacuate to a Russian escape module because of a threat of a collision with some space debris. However, NASA says the crew has now returned to the station after the danger passed.The space debris has been described as an old motor from a satellite. NASA says the evacuation to the escape module was a precautionary measure, as the Russian craft is able to leave the station quickly in case of emergencies.
Space station collision alert