The planets of the solar system maintain their orbits around the Sun due to its gravitational pull. Planetary orbits are determined by two forces: the Sun's gravity pulling them inwards and the inertia of their movement,... More »

The Earth orbits around the Sun at an astonishing 67,000 miles per hour. It takes the Earth 365 days to make a complete circle around the Sun. More » Science Astronomy Our Sun

The time it takes to orbit the Sun depends on the planet. Because of gravity, the mass of the planet and other considerations, objects closer to the Sun tend to have a faster orbit. Earth, the third planet from the Sun, ... More »

The planets of the solar system revolve around the Sun due to the force of its gravitational pull. The elliptical orbit of the planets is a result of the Sun's gravity, which acts to pull the planets closer, balanced by ... More »

The sun holds the planets in their orbits, makes life possible on Earth and converts hydrogen into helium. The sun is a large ball of gas that is undergoing a thermonuclear reaction, which enables it to bathe the solar s... More »

Earth's solar system has only one sun, but if the word "sun" is taken to mean "any star with planets in orbit," the Milky Way might have as many as 400 billion suns. If the observed ratio of approximately one planet per ... More »

One of the easiest ways to build a working model of the solar system is to suspend the sun and planets in their orbits from a circular piece of cardboard. Draw circles on the cardboard to represent the planets' orbits an... More »