Is the universe expanding?

Since Einstein's theory of general relativity has been applied to what is known about the universe as a whole, it was suspected that the universe was expanding. When Edwin Hubble and Milton Humason discovered in the 1920s that virtually all galaxies in the sky had moved from us at high speeds, the suspicion that the universe was rapidly expanding. Until 2000, however, decisive evidence was finally found in favor of the expansion of the universe in the form of extensive surveys with a red shift of very distant objects.

The expanding universe is often quoted as the most important finding in modern cosmology. At Einstein's time, the theory of a steady state was predominant, which stated that the universe remained balanced in the same size. Einstein, whose equations predicted universal expansion or contraction, but not the state artificially introduced a stabilizing variable into its equations called the "cosmological constant". After the realization of Hubble's observations that the universe is likely to expandVal, later called the "biggest mistake".

The phenomenon, which first led cosmologists and astronomers to predict the expanding universe, was Hubble's red shift analysis. Using the Mount Wilson observatory, which was the best binoculars in the world at the time, Hubble looked at distant galaxies and saw that they were gradually looking redde. He continued to look in space, and even back in time, as the light lasts many billions of years to travel from these galaxies to Earth. Because the redness factor correlated so well with the increase in distance, the Hubble suspicion that this is a reliable phenomenon with a physical cause.

The cause was determined as the following: as the universe expands, the basic space increases volume, but the light passing through it remains the same. The expanding space will pull the wavelength of light, thus extending, which is reder. Analogy thatis sometimes used, dots on the surface of the expanding balloon. Draw the waves of the waves on the ball, and while throwing it out, note the wave extends and extended. This is the same principle behind the phenomenon Redshift.

In 1998, not only was the fact that the universe is expanding, but probably expanding at the speed of accelerating. The physical reason is chalk to the mysterious "dark energy", so named, because we hardly know something about it.