Geology of solar terrestrial planets Earth, and Mars) have substantial atmospheres; all have impact craters and tectonic surface features such as rift valleys and volcanoes. The term "inner planet" should not be confused with "inferior planet", which refers to any planet that is closer to the Sun than the observer's planet is, but usually refers to Mercury and Venus. The Solar System is believed to have formed according to the nebular hypothesis, first proposed in 1755 by Immanuel Kant and independently formulated by Pierre-Simon Laplace. This theory holds that 4.6 billion years ago the Solar System formed from the gravitational collapse of a giant molecular
Martian Through Georgia bore him. When an attractive female Martian offers to pitch some love to the Martian, he just turns her away, causing her to melt. The Martian then goes to see a psychiatrist, who recommends that he must travel to another world to cure his boredom. The Martian then leaves in a flying saucer that is launched by slingshot and sent deep into space. After some time (including punching a leaking hole in the Big Dipper), he enters the Earth's solar system and stops at Earth. While observing the typical Earth activities (television antennas, people with huge and little cars, children