One of the principles of the General theory of relativity is that any rotating body in the Universe drags itself and the surrounding fabric of space-time. In order to detect a similar phenomenon near Earth, scientists require high-cost devices in the form of gravitational probes, according to the portal sciencealert.com. Fortunately for us, in the Universe there are many natural laboratories where physicists can observe the fulfillment of the predictions of Einstein in the most minute detail and without the construction of a multimillion-dollar structures. One of these places have become neighborhood recently discovered white dwarf, proving by his example, made in the early twentieth century the hypothesis of the great Austrian scientist.
The stars can rotate time in their neighborhood
Recently, researchers discovered a pair of compact stars may be evidence of a unique phenomenon predicted by albert Einstein in the early twentieth century. Revolving around each other at breakneck speed, objects moving in the strongly curved space-time, which is consistent with modern theory of relativity. So, one of its postulates indicates that the faster the object is rotated and the heavier it is, the stronger is the pressure on the surrounding matter. This phenomenon continues to be the most relevant for white dwarfs, which, despite its tiny by universal standards of sizes, we have a huge density. These objects, which are, in fact, remains of ancient stars, are able to make complete rotation around its axis for 1-2 minutes, not 24 hours, as does our Earth.
In order that astronomers were able to observe the time of rotation of white dwarfs, they often have to consider them through the orbital stars, called pulsars. Compared to white dwarfs, pulsars do not consist of atoms, but of special particles — neutrons, which make these unusual objects rotate even faster white dwarfs — more than 150 times per minute. Knowledge about the presence of pulsars such properties can help us to display the trajectory of the detected object when it rotates around a white dwarf. So, a couple of two stars, officially called PSR J1141-6545 is the ideal gravitational laboratory with mutual treatment duration less than 5 hours.