Washington: Comet Siding Spring or C/2013 A1, which is the size of a small mountain, passed extremely close to the planet Mars on Sunday (19 October 2014). Wowing space enthusiasts with an event that happens once in a million years, comet C/2013 A1 made its closest encounter with Mars Sunday at 2:27 pm (1827 GMT), racing past the Red Planet at a dazzling 203,000 kilometers per hour. The rare celestial […]