Oh thank merciful god.. Finally I can say my theory on the apocalypse!
Okay, my theory is this;
You know how stars die when they hit a certain age, and how our sun IS a giant star? Scientists say that our sun is close to dying. When stars get close to dying, they expand.
So when our sun is ready to burn out, it will expand, enveloping earth in a cloak of flames.
Also, you know how Mars was said to support life? My idea on it is that it used to be in the same position as Earth, and it used to be lush and green. The sun was very young, and when it grew to it's later stage of life, it expanded, and enveloped Mars in flame, thus ending life, and pushed Earth into the life-supporting zone, therefore making Earth habitable.
So it used to be like this.
_________(Life Spot)__________________
Sun--Earth-----Mars-----All other planets.
Now it is like this:
_______________(Life Spot)________________________
Sun--Mercury--Venus--Earth---Mars--All other planets.