•Volcanic Eruption - Giant eruptions have contributed to mass extinctions, including the one that killed off the dinosaurs around 65 million years ago. Volcanic eruptions always come unannounced. A strong volcanic eruption may cause tsunami and unzipping of the fault system.

•Terrorist Attacks - Rogue forces may take advantage of the commotion that will happen on Friday. They may pose threat to nations they have disagreement through biological warfare or invasion of the city that will yield to the deaths of many.

•Deep Impact - Another possible way how the Earth will end is through a collision of an asteroid. Asteroids typically top the list of extraterrestrial objects that could hit Earth. However, it is impossible to find every asteroid that could pose a threat to the Earth. Moreover, NASA can only find the asteroids but an asteroid that is almost the size of the Earth cannot be stopped.

•Solar Storms- Solar storms are part of the cyclic activity of the Sun. The next solar maximum will occur in the 2012-2014 time frame. Though NASA said that it could do no harm to Earth, we never know.

•Comet Collision - Comets zoom through space at almost 100,000 mph and pick up speed due to Earth's gravitational pull, he said. The faster an object moves, the bigger the force it exerts on whatever it happens to hit and the more energy it deposits. Moreover, finding comets in the outer solar system is very difficult because these dirty snowballs are extremely dark.