Gravitational waves are huge disturbances in the tissue of space-time caused by extremely active astronomical events. Scientists have published the results of observations of the collision of neutron stars, which led to the appearance of such waves. They argue that the analysis of the "cosmic accident" can shed light on the structure of the universe.
Despite the apparent static nature of the starry sky, neighboring galaxies are constantly moving away from the Earth in all directions. Scientists can not accurately explain why this is happening, but they are doing everything possible to measure the rate of expansion of the universe. This value is known as the Hubble constant (the ratio of the apparent speed of galaxy distancing to the distance to them), and it can presumably explain how the intergalactic space “works”.
Researchers have two ways to estimate the Hubble constant: an analysis of the relic radiation remaining after the Big Bang, or a decrease in the brightness of supernovae. Each of these methods leads to different results and is not considered the only correct one. The first gives a value of about 67.5 kilometers per second per megaparsec, the second gives about 74 kilometers. The newly developed third method should remove the differences of the adherents of the “classical theories”.
The essence of the method is the simultaneous observation of gravitational and electromagnetic waves caused by the merging of neutron stars. A detailed analysis of the event gave the Hubble constant value of 70.3 kilometers per second per megaparsec. Nevertheless, scientists note that in order to obtain results with an error of no more than 3%, they need to analyze at least 25 such collisions. These data can provide answers to unresolved questions about the structure of the observable universe.