Of course, the prediction was made excluding the Ahmadinejad-presses-the-red-button factor. From FoxNews:
Scientists have nailed down how and when the Earth will cease to exist. The sun will slowly expand into a red giant, pushing the Earth farther out into space, but not far enough. Our home planet will be snagged by the sun's outer atmosphere, gradually plunging to its doom inside the fiery stellar furnace. The good news: This won't happen for another 7.6 billion years. The bad news: Life on Earth will end long before then.