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
The comet’s coma or head of the comet . is a fuzzy mist surrounding the actual nucleus of the comet. Including the tail, the coma is all we actually see, watching the comet from the Earth.
The shape and structure of the comet’s coma
The shape of the coma can vary from comet to comet and for the same comet during its passage, depending on its distance from the Sun and the corresponding quantities of dust and gas. Pale or bright comets producing little dust and often have a round shape, and comets that produce a significant amount of cometary dust have fan-shaped or parabolic shape.
This is due to released different-sized dust grains: those that are bigger are moving to the left along the trajectory of a cometary orbit, and the smaller particles are repelled from the Sun using light pressure.
Coma has 2 main components: gas-shell and shell dust. In fact, scientists believe that comets produce almost the same amount of gas and dust. 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