The galaxy is a vibrant orange disk, dubbed the Big Wheel. Its life began within the universe’s first two billion years of ...

Keep reading to learn more about Earth's different layers, its atmosphere, and what makes the "blue ... the planet's magnetic field. Our planet sits in a small corner of the Milky Way galaxy ...

This week on Blue Planet II we explored the open ocean; home to some of the biggest and most spectacular creatures on earth. How much do you know about the big blue?