Earth is called the goldilocks planet because it is not too cold, not too hot, it is just right for living things. 70% of the Earth is covered in water.
The sun is the hottest part of our solar system. It is not a planet, it is a star. It takes 8 minutes for light to get in to Earth. The sun is 110 times bigger then the Earth. Some people think that Pluto is not a planet because of how small it. It is so small some people cannot see it.