Earth is the fifth-largest planet and the third from the sun.
Our planet Earth is actually a bit pear-shaped rather than a true sphere. In diameter Earth is 7,927 miles at the equator and a few miles less at the poles. The estimated mass is about 6.6 sextillion tons, with an average density of 5.52 grams per cubic centimeter. Earth's surface area encompasses 196,949,970 miles about which three-fouths is water. This planet is believed to have been born 4.5 million years ago as a solidified cloud of dust and gasses left over from the creation of the Sun.