This is what happens when Two Black Holes Collide.

This is the animation of the final stages of a merger between two black holes. What is particularly interesting about this animation is that it highlights a phenomenon known as Gravitational Lensing.

What is Gravitational Lensing?

Mass bends Light. What? 

Yeah, mass can bend Light. The gravitational field of a really massive object is super strong. And this causes light rays passing close to that object to be bent and refocused somewhere else.


The more massive the object, the stronger its gravitational field and hence the greater the bending of light rays – just like using denser materials to make optical lenses results in a greater amount of refraction.

Here’s an animation showing a black hole going past a background galaxy.


This effect is one of the predictions of Einstein’s Theory of General Relativity 

PC: cfhtlensUrbane Legend

Einstein, Dirac, Pauli, Marie Curie, Bohr, Schrodinger and many more of the scientific greats. All in one epic picture.

The Solvay Conference,1927.

Back row: Auguste Piccard, Émile Henriot, Paul Ehrenfest, Édouard Herzen, Théophile de Donder, Erwin Schrödinger, Jules-Émile Verschaffelt, Wolfgang Pauli, Werner Heisenberg, Ralph Howard Fowler, Léon Brillouin. Middle: Peter Debye, Martin Knudsen, William Lawrence Bragg, Hendrik Anthony Kramers, Paul Dirac, Arthur Compton, Louis de Broglie, Max Born, Niels Bohr. Front: Irving Langmuir, Max Planck, Marie Sklodowska Curie, Hendrik Lorentz, Albert Einstein, Paul Langevin, Charles-Eugène Guye, Charles Thomson Rees Wilson, Owen Willans Richardson.

Without Einstein, GPS would be Toast! Here’s why!

Since satellite have clocks in them, we need to take into consideration the general and special theory of relativity!

  • Since satellites have experience less gravity than on earth, according to the general theory of relativity, the clocks would run faster by 45 microseconds/day
  • Also the satellites move really fast(~3 km/s), and thus, according to the special theory of relativity, the clocks should tick slower by 7 microseconds/day
  • net result is +38 microseconds/day + eccentric variations!

Therefore these  relativistic offsets are build into the blocks which are put on satellites, without which the GPS would be futile!

(coutesy: Stanford University )