Each planet has a "closest" point (perihelion) and a "farthest" point (aphelion). With this knowledge, and the general understanding of the size of the Solar System (to its farthest orbiting planet, usually considered the dwarf planet Pluto) the distance of each planet from the Sun can be estimated. read more
The Earth is about 150 million kilometers from the Sun, which means that 1 AU is equal to about 150 million kilometers. Mars, the second closest planet to Earth, is about 228 million kilometers from the Sun. Jupiter, Saturn, Uranus and Neptune are often called the outer planets, and they are very far from the sun. read more
The inner planets (those planets that orbit close to the sun) are quite different from the outer planets (those planets that orbit far from the sun). The inner planets are: Mercury, Venus, Earth, and Mars. read more