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The Theory of Relativity, Then and Now

So although Earth appears to be pulled towards the sun by gravity, there is no such force. It is simply the geometry of space-time around the sun telling Earth how to move. The general theory of relativity has far-reaching consequences. It not only explains the motion of the planets; it can also describe the history and expansion of the universe, the physics of black holes and the bending of light from distant stars and galaxies. We now know it was hot and dense and has been expanding for the past It is also populated with incredibly warped regions of space-time called black holes that trap anything falling within their clutches.

General relativity: Black holes What happens when extreme gravity pierces the fabric of space-time?

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Space-time can tremble like the surface of a pond and it seems to be full of a mysterious form of energy that is pushing it apart. It is also conceivable for space-time to be so warped that it becomes possible to travel backwards in time. General relativity: Gravitational waves Even empty space-time, devoid of stars and galaxies, can have a life of its own Read more. Applying the principle of general relativity to our cosmos reveals that it is not static.

Edwin Hubble demonstrated in that the Universe is expanding, showing beyond reasonable doubt that the Universe sprang into being a finite time ago. The most common contemporary interpretation of this expansion is that this began to exist from the moment of the Big Bang some However this is not the only plausible cosmological model which exists in academia, and many creation physicists such as Russell Humphreys and John Hartnett have devised models operating with a biblical framework, which -- to date -- have withstood the test of criticism from the most vehement of opponents.

Theory of Relativity — A Testament to Creation Using the observed cosmic expansion conjunctively with the general theory of relativity, we can infer from the data that the further back into time one looks, the universe ought to diminish in size accordingly. However, this cannot be extrapolated indefinitely.

A Brief Outline of the Development of the Theory of Relativity | Nature

This is referred to as the Cosmological arrow of time, and implies that the future is -- by definition -- the direction towards which the universe increases in size. The expansion of the universe also gives rise to the second law of thermodynamics, which states that the overall entropy or disorder in the Universe can only increase with time because the amount of energy available for work deteriorates with time.

If the universe was eternal, therefore, the amount of usable energy available for work would have already been exhausted. This has profound theological implications, for it shows that time itself is necessarily finite. If the universe were eternal, the thermal energy in the universe would have been evenly distributed throughout the cosmos, leaving each region of the cosmos at uniform temperature at very close to absolute 0 , rendering no further work possible.

The General Theory of Relativity demonstrates that time is linked, or related, to matter and space, and thus the dimensions of time, space, and matter constitute what we would call a continuum. They must come into being at precisely the same instant.

General Relativity Lecture 1

Time itself cannot exist in the absence of matter and space. From this, we can infer that the uncaused first cause must exist outside of the four dimensions of space and time, and possess eternal, personal, and intelligent qualities in order to possess the capabilities of intentionally space, matter -- and indeed even time itself -- into being.

General Relativity vindicated

We here on Earth obey the same laws of light and gravity as someone in a far off corner of the universe. The universality of physics means that history is provincial. Different viewers will see the timing and spacing of events differently. What for us is a million years may just be a blink of an eye for someone flying in a high-speed rocket or falling into a black hole.

Special relativity came first and is based on the speed of light being constant for everyone. That may seem simple enough, but it has far-reaching consequences.

Einstein's Theory of General Relativity

Einstein came to this conclusion in after experimental evidence showed that the speed of light didn't change as the Earth swung around the s un. This result was surprising to physicists because the speed of most other things depends on what direction the observer is moving.

If you drive your car alongside a railroad track, a train coming at you will seem to be moving much faster than if you turned around and followed it in the same direction. Einstein said that all observers will measure the speed of light to be , miles per second, no matter how fast and what direction they are moving. This maxim prompted the comedian Stephen Wright to ask: "If you are in a spaceship that is traveling at the speed of light, and you turn on the headlights, does anything happen?

The answer is the headlights turn on normally, but only from the perspective of someone inside the spaceship.