Solar system. The stars and the sources of their energy. Galaxy
The solar system is called the totality of the heavenly bodies moving around the Sun, which is a dynamic centre of this system. The solar system consists of the Sun and planetary systems, including all the natural space objects that revolve around the Sun. Turn around the Sun, 8 major planets with their satellites and rings: mercury, Venus, Earth, Jupiter, Saturn, Uranus, Neptune. They are divided into terrestrial planets similar to Earth, and giant planets similar to Jupiter. These groups are very different in their physical characteristics. To natural space objects in the solar system include dwarf planets and their satellites, and small bodies: asteroids, meteors and meteorites, comets, cosmic dust. Between the orbits of Mars and Jupiter lies the asteroid belt.
The age of the Solar system approximately 4.6 billion years.
The main features of the Solar system .
The planets move around the Sun in orbits close to circular ones. Comets also move in very elongated orbits, when moving near the Sun, the comet forms a tail.
The orbits of all planets lie nearly in the plane of the equator of the Sun. Continue reading
Known in ancient Rome, the largest of all, the planet Jupiter was named after the chief deity of the Romans. Gas giant planet located outside the asteroid belt. Its mass is 2.5 times the mass of all the planets available in our system. Jupiter rotates at a speed of 13 km/s and the time it completes one rotation around its axis passes 9 hours and 55 minutes, and around the Sun planet moves almost 12 earth years.
Jupiter can be observed even in a simple telescope, it emits a white glow and is visible in the night sky, and with him his companions are visible, four of them. Jupiter is a very interesting internal structure. Stone core is surrounded by a metal “frozen” hydrogen, which covers a layer of liquid hydrogen. Jupiter has an atmosphere that consists of hydrogen and helium 99% and 1% of other gases: methane, ethane, water and ammonia. The three main layers in the atmosphere of ice giant form crystals of ammonia, methane and ammonium, water crystals, sometimes in the form of small droplets of liquid that are constantly moving in a vortex, forming a visible telescope in the dark bands. Continue reading
Astronomers have determined that comets from the far reaches of our Solar system do not threaten the Earth. The discovery was made after computer modeling of the behavior of these objects. Article researchers appeared in the journal Science . and its summary is contained in the press release of the University of Washington, where the authors of the article.
In their study, the astronomers modeled the penetration into the inner part of the Solar system comets from the Oort cloud – a region whose borders, according to various estimates, are spaced from 2 to 50 thousand astronomical units. The temporal interval was modeled astronomers, was about 1.2 billion years.
Previously, scientists were convinced that the majority of comets with a long period (from 200 to millions of years) period of treatment, currently there are about 3200, with the outer part of the Oort cloud. It was believed that comets from the inner part of the cloud protects the Solar system gravitational field of Saturn and Jupiter, which do not allow these bodies to “annoy” the Earth and other small planets. Continue reading