"Good evening. A few minutes ago, the United States ambassadors to every country in the world told the leaders of those nations what I'm about to tell you. It's a bit complicated, so we'll take some time, so I hope you'll bear with me, hear what I have to say. A little over a year ago, two American astronomers, Marcus Wolf and Leo Biederman, working on a mountaintop in Arizona, saw something in the night sky that caused them great concern. A comet. But the comet was... well, there was a remote possibility that the comet was on a path that could bring it into direct contact with the Earth. Now, we get hit all the time by rocks and meteors, some of them the size of cars, some no bigger than your hand. But the comet we discovered is the size of New York City, from the North side of Central Park to the Battery. About seven miles long. Put another way, this comet is larger than Mount Everest. It weighs 500 billion tons."