Solar System
...tellites called Phobos and Deimos. It is 142 million miles away from the Sun. Jupiter is the largest planet and has the most rings around it in the whole Solar System. Jupiter revolves around the Sun once in 12 years. Jupiter has a well-known feature with the great red spot, an atmospheric storm. Jupiter has an estimated distance from the sun with 483 million miles. Saturn, which is the second largest planet, has at least 20 satellites. Saturn also has a well-known feature. Saturn has rings which are ice particles around the planet. Saturn is 886 million miles away from the sun. Uranus, the third largest planet, revolves around the sun once in 84 years. Uranus has a North Pole tilted with 98º. Uranus is 1.8 billion miles away from the Sun. Neptune, the fourth largest planet, revolves around the Sun in 164 years. There is a Great Dark Spot on Neptune that is the size of the Earth. Neptune is 2.8 billion miles away from the Sun. Pluto is the smallest planet and rotates around the Sun once in 248 years. Pluto is 3.6 billion miles away from the Sun. A star is form when a large amount of gas starts to collapse in itself because of gravitational attraction. As it bond, the atoms of the gas smash together with increasing rate and speed. The gas then begins to heat up. Sooner or later, the gas will be so hot that when the hydrogen atoms smash together, they no longer bounce off each other, but instead form helium. The heat released in this reaction and makes the star shine. This heat also increases the pressure of the gas until it is enough to balance the gravitational attraction. Stars will remain still for a long time, where the heat from the nuclear reactions balances the gravitational attraction. In the end, the star will run out of its hydrogen and other nuclear fuels. When a star runs out of fuel, it starts to cool off. As the star bond, the gravitational field at its surface gets stronger and the light cones get turn inner more. It becomes more difficult for light from the star to escape. Then, when the star has shrunk to a positive radius, the gravitational field at the surface becomes so strong that the light cones are turned inner, so much that light can not longer escape. If light can not escape, nothing else can. Everything is dragged back by the gravitational field. This area of space-time is called a black hole. Its border line is called the event horizon, which overlap with the paths of light rays that just fail to escape from the black hole. Black holes are more gigantic than the Sun but are so dark that they cannot be seen. Matter that makes up black holes is so packed in, that it cruelly twists space and time. If anything gets too close to a black hole, it would need to travel faster than the speed of light in order to escape. Black holes lie at the middle of many galaxies, a...