When The Black Holes Collide, The Objects Around Them Can Travel Back In Time.

What Happen When Black Holes Collide?

Everything We Know About It

-Crazy Facts Of Cosmology.

When two black holes collide,the objects around them can travel back in time.

The sign of every great scientific theories is by the outcomes it predict when you run experiments or perform observations. And one of the most amazin theory ever proposed was the concept of Relativity, that means Einstein's theory of relativity .

In addition to helping us understand that light is the ultimate speed limit of the universe, Einstein described gravity itself as a warping of spacetime.

He did more than just provide a group of elaborate latest descriptions for the universe, he proposed a bunch of tests that could be done to find out if his theories were correct.

One test,  for example, completely explained why Mercury's orbit didn't match the predictions made by Einstein. Other predictions could be tested with the scientific instruments of the day, like measuring time dilation with fast moving clocks.

Since gravity is actually a distortion of spacetime, Einstein predicted that massive objects moving through spacetime should generate ripples, like waves moving through the ocean.

Just by walking around, you leave a wake of gravitational waves that compress and expand space around you. However, these waves are incredibly tiny. Only the more energetic events in the entire universe can produce waves we can detect.

It took over 100 years to finally be proven true, the detection of gravitational waves. In February, 2016, phycologists with the Laser Interferometer Gravitational Wave Observation, or LIGO announced the collision of two massive black holes more than a billion light years away.

Any size of black holes can collide. Plain old stellar mass black holes or supermassive black holes. Same process, just on a completely different scale.

Let's start with the stellar mass black holes. These form when a star with many times the mass of our sun dies in a supernova. Just like regular stars, these massive stars can be in binary systems.

Suppose a stellar nebula where a pair of binary stars form. But unlike the sun, each of these are monsters with many times the mass of the sun putting out thousands of times as much energy . The two stars will orbit one another for just a few million years, and then one will transfer as a supernova. Now you'll have a massive star orbiting a black hole. And then the second star explodes, and now you have two black holes orbiting around each other.

As the black holes zip around one another, they radiate gravitational waves which causes their orbit to decay. This is kind of mind- bending , actually. The black holes convert their momentum into gravitational waves.

As their angular momentum decreases, they spiral inward until they actually collide. What should be one of the most energetic explosions in the known universe is completely dark and silent, because nothing can escape a black hole. No radiation, no light, no particles, no screams,  nothing. And if you collide two black holes together, you just get a more massive black hole.

The gravitational waves ripple out from this momentous collision like waves through the ocean, and its detectable across more than a billion light years.