Cosmologists received a value equal to approximately 72 kilometres per second per megaparsec.
Hubble constant — parameter that relates the distance to a space object (galaxy or quasar) with the speed of his removal. In other words, every megaparsec (a unit of length, equal to more than three million light years) the speed of the object increases. This allows scientists to estimate the magnitude and age of the Universe, and calculate the rate of expansion.
However, the results, based on different observations, are not consistent with each other and gave the range of values the constant 68 to 73 kilometers per second per megaparsec. To solve the problem, cosmologists have used Jablowski space telescope, which they saw as a distant galaxy, playing the role of gravitational lenses that bend light from even more distant objects, particularly quasars. As a result, around lenses there are several images of the latter.
Galaxy bend light unevenly, so some images of the quasar are late for others. Since many of the quasars change their brightness, we can measure the time delay. This allows to accurately determine the Hubble constant.
Cosmologists received a value equal to approximately 72 kilometres per second per megaparsec. This number coincides with the results of measurements of other astronomers observed a supernova, and variable stars, but differs from the data obtained by the space Observatory Planck which measure the cosmic microwave radiation background. According to some researchers, the difference is within statistical error.
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