MOSCOW, October 24 – RIA Novosti. Re-analyze the images and data collected by the probe “Voyager 2” during its passage through the Uranus system, has allowed scientists to find two previously unknown moons of “big blue,” bringing the total number to 29 objects, according to NASA.
“We have not seen these moons firsthand, however, so that they could produce those effects in the rings of Uranus, which we found, their size should be small enough that explains why we hadn’t noticed them. Pictures of “Voyagers” just don’t have a high enough resolution and sensitivity to them can be easily seen,” said Matthew Hedman (Hedman Matthew) from the University of Idaho (USA).
Seventh planet of Solar system was discovered in 1781 by the English astronomer William Herschel and named after the Greek God of the sky Uranus. Its axis of rotation is inclined to the plane of the orbit at 97.8 degrees most of the year at the poles of the planet reigns, or polar day or polar night.
Previously it was thought that Uranium “went sideways” after a collision with a body whose mass exceeded that of the earth. However, the axis 20 of the moons of Uranus is also shifted by 90 degrees, which should not happen with a single collision. As researchers found in 2011, Uranium has acquired a modern look in a series of clashes in the first days of life in the Solar system.
In 1986, the probe “Voyager 2” flew past Uranus and obtained the first images of the planet and its moons, giving mankind the first ideas about the appearance of this mysterious and cold gas giant on the outskirts of the Solar system. For example, before the arrival of “Voyagers” to Uranus the astronomers knew about the existence of only five satellites of this planet, Oberon, Titania, Miranda, Ariel and Umbriel.
As told by Hedman, number of moons, open “Voyager-2”, may increase from ten to a dozen through the analysis of photographs and data collected by the tools of the probe while observing a thin dust ring around Uranus.
By analyzing these data, scientists noticed that one of the most striking of the dust of the rings “blink” is the density of matter in it had increased, then decreased. Something similar was observed and in the nearest to it of the beta-ring. These “flashing” led astronomers to think that the Uranium can have multiple invisible to us satellites.
They tested this hypothesis by analyzing how the radio waves that “Voyager 2” is sent to the Ground, and passed through these two “suspicious” of the ring. As it turned out, the signal was characterized by obstacles that arise in those cases when radio waves encounter solid objects on the way to the radio.
Judging by the nature of the noise, two moons of Uranus, with Hedman and his colleagues represent a small celestial body, the actual asteroids with a diameter of 2-7 kilometers. They, according to planetary scientists, consist of water and other frozen gases, dust-covered, which makes them invisible to telescopes and cameras “Voyager-2”.
Their existence, according to Hedman, explains one of the mysteries of Uranus is why it rings compared with the rings of Saturn, have such a small width. Two unknown moon, whose name is not yet rated, can “conduct” the life of the dust particles in the alpha and beta ring, not letting them to diverge and form broader bands. Both of these objects, as astronomers hope, will soon be found with the help of Hubble or ground based telescopes.