There isn't one definite answer to what will happen to Earth in the next billion years but rather a grab bag of facts about what may become of our planet, humanity, and our solar system in that unfathomable time. Obviously there are a lot of hypotheticals—it's totally uncertain how much longer humanity will survive, for one. But a lot of these facts are indisputable by science.
For example, in one million years, the star Betelgeuse (which yes, is pronounced "Beetlejuice") will explode into a supernova that anyone remaining on Earth will be able to see with the naked eye, even during the daytime. And in 250 million years, all of Earth's continents will again be connected, forming what some people call Pangea Ultima.
RealLifeLore runs down some of the other specifics on what may very well happen to the place we used to live even though we'll likely be long gone.
Obviously the most interesting, and unknowable, question is what will happen to humanity. In 20,000 years, if we are able to survive, only one of words in any language will remain the same as they are today. In two million years, if we've successfully colonised other planets, the former humans living on those planets will have evolved into species that are totally distinct from each other.
In a way, its nice to know that on a geological time frame, nothing we do is of any consequence. Even if we as a species wind up wiping ourselves out in one way or another, Earth will live on, continuing to change and evolve, with or without us.
Source: RealLifeLore
