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
A Beautiful Planet how you use those resources. It reminds us that we have to be better stewards of what we have, and be better crew members of Spaceship Earth." This portrayal of our planet as a fragile, life sustaining spacecraft is introduced in the very first scene. The film begins with a light-years-long, computer-generated trip through swarms of stars in the Milky Way; the compressed trip ends by focusing on the Solar System. Even though our planetary system seems unremarkable, it is in fact "the only place we know, in all the universe, to harbor life." In the film, Jennifer Lawrence's narration