![]() But Einstein’s theory states that there is no force of gravity, it’s just the effect of our planet as it freely falls through curved space-time around the Sun. Newton concluded the Earth’s movement was due to the force of gravity. This is why the Earth goes around the Sun in a circular orbit rather than flying out of the Solar system in a straight line. If another object tries to move in a straight line on that curved surface it will now end up following a curved trajectory. Thinking in four dimensions is difficult, so space-time can be thought of as a rubber sheet. Space-timeĪll three dimensions of space (height, width and breadth) are woven together with the idea of time to make up the fabric of the universe – space-time. In the theory of relativity Albert Einstein kept some ideas in his mind which was important for the modification of Physics. Gravity is explained by these equations, which are consistent with what we see in reality. These equations combine space and time to create space-time. ![]() The theory is a series of equations defined by Einstein. It took Einstein 10 years to make the theory work for gravity too, which is how general relativity gets its name. ![]() ![]() 'Special' means ‘in certain circumstances’ – so not including the effect of gravity. ![]() Ten years before general relativity, Einstein came up with special relativity, which explained the relationship between space and time – and how they are related to each other. ![]()
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