Is Earth totally unique? Perhaps it is, as reported by a recent study covered in a few places.
This would be kind of sad, in a way. No aliens to meet, and no other planets like the Earth… an awful waste of space, as Carl Sagan called it. It’s also an odd idea, philosophically, because for hundreds of years astronomers have considered the Earth as nothing particularly special (the “Copernican Principle” from the Mic.com article). This idea has been backed up by discoveries that the laws of physics and the laws of chemistry are the same everywhere in the universe… If that’s true, there should be nothing preventing the processes that formed the Earth from happening somewhere else.