The sun is a medium size star. It is a sphere of burning gas. The sun is 100 times bigger than the earth, and has no real surface. The temperature on the sun is 10,000 degrees F, and 500,000 degrees C.
The Earth is 4-6 times bigger than the moon. It has atmosphere, running water, and is the only planet that supports life. The Earth is a sphere of rock.
THe moon is a sphere of rock.It has no atmosphere, and is scarred and cratered.It takes about 28 days to orbit the Earth.