brightness

Planets of the solar system.

Solar system – 8 planets and over 63 of the satellite, which are opened more often, several dozen comets and many asteroids. All cosmic bodies move in their precise directional trajectories around the Sun, which is 1000 times harder than any body in the solar system combined. The center of the solar system is the Sun – the star around which orbits the turning of the planet. They do not emit heat and not light, but only reflect the light of the Sun. In the solar system now officially recognized as the 8 planets. Briefly, in order of distance from the sun, we list them all. And now a few definitions.

A planet is a celestial body that must satisfy four conditions:

1. the body must revolve around the star (for example, around the Sun);

2. the body must have sufficient gravity to have a spherical or similar shape;

3. the body should not be near its orbit of other large bodies; Continue reading

Space and Earth

Space when observed with the naked eye

Comets and meteors

Unlike stars and planets that the naked eye perceives as a luminous point, the comet is observed in the form of an elongated spot, in which through careful observation can see the relatively bright concentration – “head” and a conical “tail”. With the aid of the telescope each year find 5-10 comets, but rarely any of them are so bright that accessible to observation with the naked eye. Like planets, comets move around the Sun. But unlike the planetary orbits of the trajectory of comets typically have very elongated. The periods of revolution around the Sun fills the interval from a few years (comet Encke is for 3.28 years) to several thousand years (comet Hale-BOPP – 3000 years).

Comet Hale-BOPP

The comet nucleus, from which emerge jets of gas, plasma and dust all the more intense, the closer to the perfect Sun the comet is a huge (from kilometers to tens of kilometers in diameter) snowball. It is composed of molecules containing hydrogen, oxygen (e.g., H 2 O), carbon and nitrogen, as well as from dust, which escapes as ice sublimation (i.e., in the transition to the gaseous state under the action of radiation of the Sun). In the core there are larger solid particles. Continue reading

Sun Solar system

The sun is an ordinary star, whose age is about 5 billion years. On the Sun’s surface temperature is about 5.5 degrees Celsius, in the center, it reaches 14 million degrees. The sun is a huge ball of gas, the diameter of which is almost 109 times the diameter of Earth. But in relation to other stars the Sun is not too big.

The yellow light of the Sun comes from the layer of the solar atmosphere, having a thickness of 500 km and is called the Photosphere. Almost all solar energy, including heat and light, comes to us from the Photosphere, although it originally produced in the depths of the Sun.

Bubble surface

The surface of the Sun — blistered. These bubbles, or foam, is called the solar fraction. Due to convection in the solar atmosphere, the thermal energy from the lower layers is transferred to the Photosphere, giving it a foamy structure. In the 1960s, astronomers found that the upper atmosphere of the Sun approximately once every five minutes is raised and lowered. So the Sun seems to vibrate. By studying these vibrations, astronomers hope to find out what is inside a sun ball. Continue reading

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