The origin of the solar system
The sun and the solar system was formed about 4.5 billion years ago. The solar system originated from a cloud, composed of gas and dust particles moving. Under the influence of its weight of it formed a disk in the center of which formed the Sun .
Gradually within the disk began to form solid materials. They faced each other, whereby a large celestial body. Their size corresponds to the existing planets. Inside the nebulae, where the temperature was high enough to form rocky planets. Far from the center formed the giant planets, they contain a large amount of ice, and they were surrounded by a thick layer of gas.
Within the Solar system the temperature even higher, and planets formed from rocky debris of the solar nebula. They are in contact with each other, forming a large celestial body. They attract each other by virtue of the power of the law of gravity and give birth to planets of terrestrial group. The atmosphere of the Earth and Venus, the largest among them, tight.
The atmosphere of Mars, a smaller planet is less dense, and mercury. the smallest planet of this group, it is very sparse compared to earth is not readily available. Continue reading
Comet Churyumov-Gerasimenko are two comets stuck together
The researchers of the mission “Rosetta” said the comet 67/P Churyumov-Gerasimenko acquired its form as a result of collision at a low speed of two different comets in the early development of the Solar system.
A team of researchers under the leadership of astrophysics Massironi Matteo (Matteo Massironi) from the University of Padova (Italy) look at the Photos of the comet 67P/Churyumov-Gerasimenko, taken in high resolution in the period between 6 August 2014 and 17 March 2015, it Became evident that the comet was formed as a result of collision of two different bodies, flying at low speed. The results of the ESA study says .
Recall, the first images of the comet from close range, the probe “Rosetta” in July 2014 showed that the object consists of two “blocks” of different sizes. and resembles the shape of a rubber duck. Scientists examined two hypotheses: the first is that the cosmic body had acquired such an unusual form as a result of a collision between two comets, and another stated that the “neck” of the comet formed in the process of natural erosion of rocks that make up the object. Now, however, the researchers got convincing evidence in favor of the first. Continue reading
The biggest of all open still planets astronomers found in the constellation of Hercules.
Space body, named TrES-4, is drawn around the star GSC02620-00648, remote from the Earth at a distance of 1435 light-years. A new extrasolar planet about 70% larger size than Jupiter, but has a much smaller mass, which indicates its extremely low density. In addition, the object is deleted only 7 million kilometers from its star, making its surface extremely hot, over 1300 degrees Celsius.
Around its star turns the planet every 3.55 days, you one earth week to two years, listed on TrES-4. Because of the relatively weak gravity TrES-4, probably permanently loses a part of the upper layer of its atmosphere, which stretches behind the planet in the form of a curved tail resembling a comet.
“This is the largest of all known exoplanets, says lead researcher George Mandushev from the Lowell Observatory. It is so large that using existing scientific models to superhot giant planets its size is quite difficult to describe. Continue reading