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The gigantic dimensions of the Universe are incomprehensible to the human mind, nevertheless, the Universe is real! It will take about one hundred thousand years to cross our Milky Way galaxy, and it will take about two million three hundred thousand years to fly to the nearest galaxy Andromeda Galaxy. The next galaxy is twenty million light years away, and there are billions of galaxies ahead! Contrary to popular opinion, the size of the universe doesn’t increase, but it makes impossible for alien guests to appear. And this is the main problem of ufologists and science fiction writers. Travels, even at the speed of light, would take millions of years in our universe! And no person or living creature is capable to survive in this flight. The distances from the Earth to other planets outside the solar system are so great that communications between them are impossible in principle. To date, no habitable planet is known, either in the solar system or beyond, which is evidence of the u
