Extraterrestrials have a big problem with the cold in the universe and therefore can not travel to us?
The universe is getting colder by the extension. All the galaxies away from each other seek, and thus expandsthe universe. All matter is diluted, and the wavelength of the radiation in the universe exists, consequently stretched apart.Radiation with a wavelength longer has to some extent lost its energy. One can assign to the universe a temperature. Previously, the very high, millions of degrees. It has now cooled so far that the universe has a temperature of - 270 ° C. So it is ca. 3 ° C above that absolute physical zero point.
The universe is getting colder by the extension. All the galaxies away from each other seek, and thus expandsthe universe. All matter is diluted, and the wavelength of the radiation in the universe exists, consequently stretched apart.Radiation with a wavelength longer has to some extent lost its energy. One can assign to the universe a temperature. Previously, the very high, millions of degrees. It has now cooled so far that the universe has a temperature of - 270 ° C. So it is ca. 3 ° C above that absolute physical zero point.
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