Wilderness areas are parts of national parks, wildlife refuges, national forests, and the public domain. Today, there are 107.5 million acres of wilderness spanning 44 states and Puerto Rico, accounting for 4.82% of the United States. About half of that total is in the state of Alaska.
Small size. Earth is the largest of the Inner Planets, with a diameter of 12,756 km (7,926 miles). Mercury is the smallest with a diameter of 4,878 km (3,031 miles) Huge! Jupiter, the largest planet, has a diameter of 142,984 km (88,846 miles). Neptune is the smallest of the Outer Planets with a diameter of 49,532 km (30,779 miles) Have solid surfaces and thin/no atmospheres. In theory, it would be possible to stand on each of the Inner Planets, although you would only survive on Earth.
These planets can be divided into terrestrial planets (Mercury, Venus, Earth, and Mars) and gaseous planets (Jupiter, Saturn, Uranus, and Neptune). The smallest planet is Mercury, which is closest to the sun. Venus is the second from the sun. It is similar to Earth in size and mass, but it is so hot, that lead would melt on its surface. The third from the sun is Earth. Its distance from the sun allows it to have liquid water and an atmosphere suitable for life.