Comets: the oldest inhabitants of the Solar system
J. L. Lagrange (1813) was also based on firmly established facts – the presence of comets that definitely move in elliptical orbits, including short-period. He explained the origin of comets gigantic volcanic explosions – emissions (eruption) with giant planets. It is, in principle, could explain the nature of the orbits of short-period comets. Subsequently, the views of La Grange shared and developed a number of scientists, among which the most important contribution of the Soviet astronomer S. K. Bo, who worked in this direction with the 20-ies to 80-ies of our century. He has eliminated the biggest internal difficulty is the concept of Lagrange – the necessity of the ejection of cometary masses (nuclei) with the “surface” of the giant planets with their powerful gravity fields, the overcoming of which requires an initial speed of 60 km/s and more. Giant planets also have thick (the length of many thousands of miles) and very dense atmosphere, in the middle of the twentieth century has been very problematic the very existence of a solid surface planets – giants beneath these atmospheres. Continue reading
Solar system is a system of planets orbiting around a star, the Sun. Among those planets is our Earth. The solar System consists of the sun and of celestial bodies held by solar gravity. The mass of the sun is about 330 000 times the mass of the earth and makes up 99.8% mass entire solar system. The diameter of the sun is 1 400 000 km, i.e. about 109 Earth diameters. In the solar system except the sun is made up of eight planets, over 150 moons, and small bodies such as asteroids, comets and meteors.
In order of proximity to the Sun, the eight planets are mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
To measure distances in the solar system is used “astronomical unit” (AU). One AU corresponds to the distance from the earth to the Sun. Thus, the distance of one AU is nearly 150 million kilometers. For example, Jupiter rotates on its orbit 5.2 AU, i.e. the distance from the Sun is 5.2 times larger than the Earth. Continue reading
China completed test heavy carrier rocket “Changzheng-5” (“long March 5”), which will be the basis for its lunar missions. Federal news Agency – at what level is the celestial space.
About the end of the test “Changzheng-5” according to the Chinese media. The development of these rockets was originally planned to be completed in 2008, but funding was only allocated in 2007. In the end, the first tests began in September of last year, and the first test flight is scheduled for September. In 2017 it is planned with the help of this rocket launch to the Earth return vehicle “Chang’e-5” to collect the local soil.
“Changzheng-5” refers to the basic Chinese family of rockets, named in honor of the legendary long March of the Communists in the Civil war in China. “Changzheng-1” was created on the basis of a ballistic missile with a nuclear warhead “Dongfeng-4”, launched in 1970 the first Chinese satellite. In fact, from this time begins the history of taikonautti – space Chinese.
However, prior to the 1990-2000-ies the development of the Chinese space was neither good, nor bad. And only in the last 10-20 years there was a serious success. But the speed of development was downright cosmic. Continue reading