earth IS THE THIRD CLOSEST PLANET TO THE SUN, AND THE ON WE LIVE ON. earth IS THE ONLY PLANET IN OUR SOLAR SYSTEM THAT HAS JUST THE RIGHT CONDITIONS TO SUPPORT LIFE, and the only known planet to have water on its surface. Earth has one moon, and is the only planet of the inner planets to have a massive moon. Earth's core, which is made up of iron and nickel, produce a strong magnetic field the protects the earth from solar winds from the sun. A year on earth is actually 365.26 earth days, and a day on earth actually last for 23 hours and 56 minutes.