Comet ISON, discovered in September of last year by Russian Vitali Nevski, is headed in our direction. And although the sungrazing comet is still more than 394 million miles away (a little closer than Jupiter's current orbit), NASA's Hubble telescope managed to capture an amazing photograph on April 10.
NASA believes that when ISON is at its closest point to the sun on November 28 of this year, it will briefly become brighter than the moon in the sky, making it a serious contender for "comet of the century."
Currently, the comet is headed toward the sun at a speed of around 47,000 miles per hour and has a dusty head of around 3,100 miles wide (about 1.2 times the width of Australia). Its tail trails more than 57,000 miles behind. And yet, the core of the comet's head is tiny -- no more than around 3 to 4 miles across. … Read more