A spiral galaxy, one of the billions of islands of stars moving across the dark matter that is known as the universe, it rotates like a huge galactic wheel, pulling countless stars within its titanic gravitational pull. This particular galaxy is known as the Milky Way, 100,000 light-years across and 1,000 light-years thick. Like a grain of sand pulled by an ocean current, an asteroid races through the galaxy. The asteroid measures nearly seven miles in diameter, and has been moving through the galaxy since the dawn of time, passing planets and other asteroids. It is now on a collision course with a medium sized planet. The planet is still millions of miles away, but the asteroid is approaching quickly. The planet is warm and tropical, and also has an abundant source of water, oxygen, and life. The asteroid hurdles towards Earth, nothing can stop it. When it impacts, it will cause world-wide destruction and chaos. The countdown to extinction has begun.