How could we defend Earth against an alien Invasion? Do we even stand a chance? Could the United States, Russia and China ...

We've all seen the movies - strange lights in the sky, flying saucers hovering ominously, and panicked news anchors declaring Earth's final stand. But if E.T. and his mates really did decide to pay us ...

Do aliens exist? Based on how many alien invasion movies there are, you'd be forgiven that there's gotta be some proof of extraterrestrial life—and that the aliens are out to get us here on Earth. But ...