The End of the Earth, how do you think it will happen? Options

[Frostedflakes616]

There are many theories on how the world will end for us, on how the Earth and us with it will be destroyed.

First Theory:
As you all know of the Big Bang, which is believed to be the start of the universe. Some say that the universe may go back to that little sized pearl and we will be destroyed.

Second Theory:
If you did not learn this in school, the sun is a star. And all stars have life and death. Their death is when they explode becoming a nova/supernova. Which means the sun will have one as well. They say eventually, the sun will end life and explode, destroying the Earth.

These are the two main theories that I know about. What do you think? Do you think the universe will go back into the pearl sized amount of gas? Or will the sun blow us up?

You decide. If you know of another theory, feel free to mention it.

My Opinion:
The first theory in my opinion is highly unlikely. I don't believe the whole universe will shrink back. If anything, the universe will keep expanding forever. I do believe in the second theory, but that will probably not last for another couple million or even billion years. If not that, we'll be destroyed by a meteor or colide with another planet, both seem to be unlikely. So if we don't get destoyed by another planet (by collision) or by a meteor, the sun will blow up on us.

[xXYouMeBedNowXx]

I have a few possibilities:
EARTH-BORN CAUSES
Nuclear Fallout
Probably the one that humans would be the most direct and immediate cause to the Apocalpyse. Very simply, someone, somewhere, will be idiotic enough to launch an aggresive nuclear attack against a powerful country. Simple retaliation, and the Nuclear fallout will quite possibly poison and destroy all life on Earth as we know it. Except the cockroaches.

Global Warming
A major climate shift has recently been observed, where the overall temperature of the world will rise significantly, and the sea levels will rise a dozen or more feet within a decade. Already, there has been evidence of this kind of a change happening where ice caps and glaciers all over the world have been melting. The amount of greenhouse gases that traps the sun's heat in our atmosphere is causing the overall temperature of the world to rise significantly, and at a dangerous pace.

Viral Plague
We know that as man continues to progress in the attempt to wipe out disease completely, that we rule out as much disease as we can -- except simply, the ones that are too strong to kill. Scientists have hypothesized that the causes of the last five to six extinctions were due to an unstoppable virus that kills off almost all life on the Earth. However, once it wins, there are no longer any hosts for the virus to infect, and the disease becomes dormant again. If Ebola had an evolved state of form, or some other disease, it's a large possibility. AIDS anyone?
DERIVITAVE: Flesh-Eating Zombies
Resident Evil, guys. T-Virus.

COSMIC EXTINCTION
Chances are that humanity will die off before anything on the cosmic scale will occur. But if we do...
The Sun
Precisely. The sun would get far too hot for anything on Earth to survive before it got to its premature stages of implosion/explosion. But if we do survive, humanity may be forced to move somewhere else.

Meteor
Dinosaurs all over again. A large meteor could definetely cause extinction of many species, and if not extinction, a large enough chunk to completely undermine the fabric of human civilization.

Andromeda
The closest neighboring galaxy we have is Andromeda. And it is heading millions of miles an hour straight toward the Milky Way. If you are familiar, Scientists believe that at the center of every galaxy is a Black Hole; the "sun" of the galaxy that holds it together. The thing that is so special about Black Holes is that they can merge. If these two super black-holes were to merge, it might very well implode on itself. If not, the Galaxies are crashing into each other anyways.
DERIVITAVE: Big Crunch
Like the Big Bang, when everything exploded, the Big Crunch is the exact opposite. A larger scale of the above theory is that all black holes will eventually merge, and develop into the origin of the next universe that will explode. Then it will implode again. Then explode. etc. etc.