The main difference between inner and outer planets is that outer planets are larger and are mainly made of gas. The inner planets are Venus, Mercury, Mars and Earth, while the outer planets are considered to be Saturn, Uranus, Neptune and Jupiter.
All of the inner planets are considered terrestrial planets due to the fact that their surfaces are made mostly of solids. These planets have no or few moons, with Earth having one moon, and Mars having two. In contrast, the outer planets are much more likely to have moons and rings. For example, Jupiter, known to be the largest planet in the solar system, has several moons.Learn More
The planet Uranus is unable to support the kinds of living organisms that exist on Earth. Nobody knows for sure whether life exists on Uranus, but if there is any life there, it must be capable of surviving in conditions that are very different from those of Earth because of Uranus' extreme tilt and other features.Full Answer >
Jupiter has the shortest day of any planet in the solar system, taking just under 10 hours to complete a single rotation. Due to the speed of its rotation Jupiter has been flattened into an oblate spheroid with a longer diameter at its equator than at the poles.Full Answer >
Mars' gravitational pull is 3.724 meters per second on the surface. The pull is 62 percent weaker than Earth's surface gravity which exerts a pull of 9.8 meters per second.Full Answer >
The Earth spins on its axis due to angular momentum conservation. The Earth was formed when leftover gas from the sun condensed into planets. As the gas cooled, it condensed, which caused the Earth to start spinning. Because it is no longer condensing, the Earth will keep spinning at a steady rate and will continue to do so unless it is stopped by some external force.Full Answer >