Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

These findings could lead to a better understanding of the inner workings of our planet and how life here will evolve over time. The Earth is made up of different layers. The outermost is the ...

After Friday's spectacle, a "planet parade" of this size won't appear in the night sky for several years, experts say.