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Einstein general theory of relativity is the best model for gravity so far, and has been confirmed in experiments and observations. According to the theory, regardless of one’s point of view (as measured by speed and direction), physical law and the speed of light are unchanged. This implies that measurements made in time and space are not absolute, but relative to your particular point of view or reference frame. General relativity led to concepts and theories such as black hole, parallel universes, worm holes, and space-time. Special relativity is Einstein’s rejection of the notion that space and time are absolute, based on the observation that the speed of light is independent of the motion of an observer. No matter how fast someone runs toward you with a flashlight, the speed of the light that flashlight emits will always remain the same. From this foundation, Einstein constructed a revolutionary model of gravity and a universe full of unexpected surprises like black hole, gravity waves, time dilation, and the equivalence of mass and energy: E=Mc^2. Astronomers and astrophysicists regularly use the theoretical tools of special relativity to interpret and analyze light.

Featured Images

Paths of stars that pass close to the supermassive black hole at the center of the Milky Way Galaxy

Jumbled Stars April 18, 2020

Time machines

Time to Ponder September 20, 2019


Shooting the Moon July 22, 2019

Radio Programs

Time Machines Taking a trip into time September 20, 2019

Moon and Regulus How time can stand still January 22, 2019

Moon on the Move The Moon moves across the sky August 15, 2017

The Great War, III The man who solved Einstein’s equations May 11, 2016

The Great War, II Science in the battlefields of Europe May 10, 2016

To the Future! Traveling into the future February 18, 2016

Back in Time You just can’t go back February 17, 2016

Arrow of Time Going forward in time February 16, 2016