Life on Earth

The timeline of life evolving on Earth
Credit: LadyofHats

Life on Earth has taken billions of years to evolve. Life includes anything which can do the following things:


    Earth's atmosphere from the
    International Space Station (ISS)
    Credit: NASA
    Some planets and moons are covered in a thin layer of gases, called an Atmosphere, which is held in place by the gravity of the body. This means that small planets and moons, which have small gravitational pulls, tend not to have them.