A kilometre-wide asteroid, said to be 'potentially hazardous', is travelling at a speed of 54,717 kmph roughly, according to a report published in IGN. A kilometer-wide asteroid is said to be 'potentially hazardous. (Image for representation: AP/NASA) Video Credit:Space Sim A fast-approaching asteroid, said to be bigger than any man-made structure, is likely to zoom past Earth at 6:05 am on Saturday, a media report had said while quoting NASA's Center for Near-Earth Object St