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As you know, all the distant galaxies of the Universe "run away" from us at a rate directly proportional to the distance to them (Hubble's law). At a distance of about 5,000 megaparsec (1,5*10²⁸ cm), the escape velocity of galaxies in the universe reaches the speed of light. This means that light from such a distance will never be able to reach us, and this distance is called "the light horizon of the universe"...

Venus never has clear days, because it is constantly covered with a thick (15 km) layer of clouds of concentrated sulfuric acid. Venus is the hottest planet in the solar system; the temperature on its surface, reaching +464 degrees Celsius, remains practically constant from the equator to the poles, day and night...

There are signs that Mars and Venus once also had some of these characteristics. But, at present they do not possess these properties. Scientists do not have convincing evidence of the existence of life in any form, past or present, nowhere, except the Earth...

Currently available knowledge about the planet Mercury has been obtained, mainly, using the spacecraft Mariner-10 and radar observations from the Earth, when in the direction of the planet Mercury impulses of radio waves are transmitted, and then they study their reflection. The planet Mercury is dotted with impact craters...

With its inimitable system of rings, the Saturn is a beautiful sight. Saturn refers to giant planets like Jupiter; Its diameter is more than 10 times the earth's diameter. Because of the high speed of self rotation, the compression of the planet Saturn, like Jupiter, is very great. Despite the large size of the planet Saturn, the gravity on it is only slightly larger than on the Earth, since its substance has a low density...

The Jupiter is a giant among the planets. The diameter of its equator is more than 10 times greater than the earth's, but the polar diameter is noticeably smaller: Jupiter has significant compression. This can serve as an indication of a large value of the speed of rotation around its axis; day on Jupiter last less than 10 hours, the year, on the contrary, about 12 Earth years...