Universal Speed LimitĮinstein's famous equation E=mc 2 contains 'c,' the speed of light in a vacuum. Credit: NASA/DOE/Fermi LAT Collaboration | › Full image and caption 1. For comparison, the energy of visible light falls between about 2 and 3 electron volts. This image, constructed from more than six years of observations by NASA's Fermi Gamma-ray Space Telescope, is the first to show how the entire sky appears at energies between 50 billion (GeV) and 2 trillion electron volts (TeV). Here are 10 things that result from Einstein’s theories of relativity: The same is true for Einstein's slightly older theory, special relativity, with its widely celebrated equation E=mc 2. General relativity has many important consequences for what we see in the cosmos and how we make discoveries in deep space today. The world celebrated the results of this eclipse experiment - a victory for Einstein, and the dawning of a new era of our understanding of the universe. But until the eclipse experiment, no one was able to test Einstein’s theory of general relativity, as no one could see stars near the Sun in the daytime otherwise. This means the apparent positions of background stars seen close to the Sun in the sky - including during a solar eclipse - should seem slightly shifted in the absence of the Sun, because the Sun’s gravity bends light. A massive object such as the Sun bends the spacetime blanket with its gravity, such that light no longer travels in a straight line as it passes by the Sun. Essentially, Einstein thought space and time were intertwined in an infinite “fabric,” like an outstretched blanket. One hundred years ago, on May 29, 1919, astronomers observed a total solar eclipse in an ambitious effort to test Albert Einstein’s general theory of relativity by seeing it in action.

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