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Gravitation is responsible for making objects accelerate towards each other as well as for the formation of the [[Earth]] and [[Sun]], the [[stars]] and the [[planets]].
Gravitation is responsible for making objects accelerate towards each other as well as for the formation of the [[Earth]] and [[Sun]], the [[stars]] and the [[planets]].
An objects escape speed is the velocity required to escape the gravitational pull of a another object, usually a planet. It ca be expressed as:
:<math>v = G \sqrt \frac{2 G M}{R}</math>
Where:
''v'' is necessary velocity
''M'' is the mass of the planet
''R'' is the radius of the planet
''G'' is the [[gravitational constant]]: 6.67428x10<sup>-11</sup> N m<sup>2</sup> Kg <sup>-2</sup>
==Gravity and Modern Physics==
==Gravity and Modern Physics==