There are so many different ways that the world could end. The 'Sun Exploding/Dying' theory is quite likely. Or maybe a giant meteor will destroy it, or at least wipe out all of the life (possibly leading to a new species inheriting the Earth). Maybe an alien race could destroy the Earth:
If they're miserable-They see us, are jealous of us, destroy us.
If they're advanced-They see us, see us as pathetic/useless, destroy us.
If they're just plain hostile-They see us, destroy us.
Or maybe some other way, who knows, wait and see.
If they're miserable-They see us, are jealous of us, destroy us.
If they're advanced-They see us, see us as pathetic/useless, destroy us.
If they're just plain hostile-They see us, destroy us.
Or maybe some other way, who knows, wait and see.