Asteroid struck by Nasa probe leaves 10,000km trail- PublishedA new image shows that an asteroid which was deliberately struck by Nasa's Dart probe has left a trail of debris stretching thousands of kilometres.The probe was crashed last week to test whether asteroids that might threaten Earth can be nudged out of the way.The extraordinary image was taken two days after the collision by astronomers in Chile, who were able to capture the vast trail using the Southern Astrophysical Research Telescope (Soar)."It is amazing how clearly we were able to capture the structure and extent of the aftermath in the days following the impact," said Teddy Kareta, an astronomer involved in the observation."We're embarking on a new era of humankind, an era in which we potentially have the capability to protect ourselves from something like a dangerous hazardous asteroid impact."