Absolutely all the planets of the Solar system, except Venus and mercury, can boast the presence of at least one stable satellite rotating in orbit of a particular planet. So, even the recently demoted from planetary status of Pluto, boasts a huge size relative to its satellite Charon. So how is it that two full planets — mercury and Venus — would be without satellites?
Mercury could be a satellite of Venus
There are at least 2 theories as to why two of the first solar system there is a lack of any satellites. One of the highly original theory says that mercury was a satellite of Venus, which is indicated by the similarity of its surface with the surface of the moon.
According to this hypothesis, after about 500 million years after the formation of the Solar system, mercury, in that distant time, yet who was the companion of the young Venus, somehow escaped from its gravitational embrace and travelling to the Sun, where he found his own orbit. This development resulted in a powerful heating of the surface of Venus and the emergence of a dense atmosphere with a large proportion of the sulfuric acid. Well, it seems the planet was mad as hell after such an unceremonious breakup.
See also: Venus turned into a hellish planet of the tides of ancient oceans
At the slowly rotating planets can not be satellites
One of the theories that could explain the absence of satellites of Venus and mercury, is the hypothesis of a too slow rotation of these planets around their axes. Know that a day on mercury lasts about 58 earth days, while on Venus this figure is equivalent to 243 days. Because of the extremely low-speed rotation of the planets, their stationary orbit, which could theoretically be hypothetical satellites are very far from the surface of the planet. According to the laws of gravitodynamics, all objects located below the stationary orbit will gradually decrease in a spiral path toward their planet until, until they are pulled by gravity and will not fall on the surface of his cosmic master. So, a similar phenomenon we can observe in the orbit of Mars, where the moon Phobos is gradually reduced and after about 3 million years will be in the gravitational trap of the planet, which will cause its rapid decline on the red surface of Mars.
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The theory about the fall of the satellites to the planet’s slow rotation can be confirmed and the strange rotation of Venus, which is opposite to the standard direction of motion of the planets of the Solar system around its axis. In other words, falls on the surface of Venus Sputnik could radically change not only its climate, but literally flip the world “upside the head”, the consequences of which we can observe today.