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- Universal Speed Limit. Einstein’s famous equation E=mc2 contains “c,” the speed of light in a vacuum. Although light comes in many flavors – from the rainbow of colors humans can see to the radio waves that transmit spacecraft data – Einstein said all light must obey the speed limit of 186,000 miles (300,000 kilometers) per second.
- Strong Lensing. Just like the Sun bends the light from distant stars that pass close to it, a massive object like a galaxy distorts the light from another object that is much farther away.
- Weak Lensing. When a massive object acts as a lens for a farther object, but the objects are not specially aligned with respect to our view, only one image of the distant object is projected.
- Microlensing. So far, we’ve been talking about giant objects acting like magnifying lenses for other giant objects. But stars can also “lens” other stars, including stars that have planets around them.
The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity.
In his four papers, published in November 1915, Einstein laid the foundation of the theory. In the third in particular he used general relativity to explain the precession of the perihelion of Mercury. The point at which Mercury has its closest approach to the Sun, its perihelion, moves.
Nov 25, 2015 · A century ago, physicist Albert Einstein unveiled a theory that would change the world — general relativity. It would cement his place at the top of the pantheon of scientific minds, and see him transformed into a modern icon. But what is general relativity, and why does it matter?
Mar 5, 2015 · The theories of relativity by Albert Einstein revolutionized how the world thinks about space, time, mass, energy and gravity. FULL STORY: General Relativity at 100: Einstein's Famous Theory...
Nov 9, 2015 · In 1905, Einstein decided that it is the invariance of the laws of physics that should have the highest status, and postulated the principle of relativity: that all inertial frames are...
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Nov 25, 2015 · When Einstein put forward his general theory of relativity, that gravity itself is the bending of space and time by mass and energy, it was a seminal moment in the history of science.
