There is no gravity in space, everything is weightless.
Motion and mutual gravitational attraction.Another Perspective:Gravity is the only thing required, which is fortunate because it's the only thing there is.
Gravity. Magnetism is a fairly short-range force, but gravity goes on forever.
One force is the gravitational connection between our sun and the planets that make up the solar system. Electromagnetism holds atoms together. Two types of nuclear forces hold the nuclei of the atom together.
Forces hold the Universe together. On a closer to home base, the forces also hold our solar system together, allowing us to ask questions on Answers.com. (Gravity exerts a weak force the works from long distances, EM exerts a strong force that works from long distances, and Nuclear forces would take too long to explain.)
There is an intense amount of gravitational energy at the centre of the solar system, this is what is holding the sun together and keeping the reactions between the hydrogen atom happening That same energy holds the planets in orbit, so its pretty strong =]
No, it's the other way around: atmosphere needs gravity to stay on a planet. Artificially, pressurized compartments can maintain atmosphere though. Such is the case on the International Space Station.
It is gravity that holds the planets in their orbits around the sun. Gravity is what gives "shape" to the solar system, to galaxies, and is the large-scale organizer of the universe as a whole.
Well... any planet in our solar system is round, that's because a planet uses it's own gravity to hold itself together in a tight spherical shape. Mars isn't HUGE it's smaller than earth.
Yes, with no Sun, there would be no large force of gravity to hold the solar system together. Each of the planets would carry on in a straight line (more or less) rather than in an ellipse around the Sun.
It is generally believed that gravity holds the universe together.
Gravity holds the local group of galaxies together.
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