A spacecraft that ploughed into a small, harmless asteroid millions of miles from Earth succeeded in shifting its orbit, Nasa said as it announced the results of its save-the-world test.The space agency attempted the first test of its kind two weeks ago to see if in the future a killer rock could be nudged out of Earth's way.The Dart spacecraft carved a crater into the asteroid Dimorphos on September 26, hurling debris into space and creating a comet-like trail of dust and rubble stretching seve

A spacecraft that ploughed into a small, harmless asteroid millions of miles from Earth succeeded in shifting its orbit, Nasa said as it announced the results of its save-the-world test.The space agency attempted the first test of its kind two weeks ago to see if in the future a killer rock could be nudged out of Earth's way.The Dart spacecraft carved a crater into the asteroid Dimorphos on September 26, hurling debris into space and creating a comet-like trail of dust and rubble stretching several thousand miles.