- a solid body of cosmic origin, that on the surface of the earth.
Meteoroid enters the Earth's atmosphere at speeds of about 11-25 km / sec. At this speed, he starts his warm-up and glow. Due ablation (burning and blowing off the oncoming stream of particles of matter meteoric body) body weight which came to earth, may be considerably less than the mass entering the atmosphere. For example, the body, which became part of the Earth's atmosphere at a speed of 25 km / s or more, burns almost no residue. At such a speed re-entry of tens and hundreds of tons of the initial mass to the earth reaches only a few kilograms or even grams of the substance. Traces of burning meteor body in the atmosphere can be found throughout most of the trajectory of his fall.
Meteor - (from the Greek. - "Heaven", "shooting star") - a phenomenon that occurs during combustion in the Earth's atmosphere of small meteoroids (eg, fragments of comets or asteroids). A similar phenomenon of higher intensity (brighter than magnitude -4) is called a bolide. Classified as counterclaims and catching. Most meteors are grouped in meteor showers - constant mass of meteors that appear at certain times of the year, to a certain side of the sky.
Meteoroid - a celestial body, intermediate in size between the interplanetary dust and asteroids. According to the official definition, meteoroids - a solid object moving in interplanetary space, the size is much smaller than an asteroid, but is much larger than an atom. The British Royal Astronomical Society has put forward another language stating that the meteoroid - a body diameter of 100 m to 10 m. Other sources limit the size of the meteoroid at 50 am visibly meteoroid entered the Earth's atmosphere is called a meteor, a meteoroid falls down on the surface of the Earth - meteorite.
appeared on the surface of outer body in the fall of another body of smaller
Fireball - (from the Greek. - Javelin) - meteor brightness not less than-4m (brighter than the planet Venus), or having a noticeable angular size (someone) . The International Astronomical Union has no official definition of "fireball". Bolide flight path normally hyperbolic. Upon entering the Earth's atmosphere leaves a trail (tail) of dust and ionized gases. From the car may break away and fall to Earth meteorites. Flight may be accompanied by a sound or radio blackout. Particularly bright fireballs are sometimes called superbolidami.Krupnye fireballs can be seen during the day.
Asteroid - a small celestial body planetopodobnoe the solar system, orbiting the Sun. Asteroids, also known as minor planets, considerably inferior to the size of planets. One way of classification is to determine the size of asteroids. The current classification determines the asteroids as objects with a diameter of more than 50 m, separating them from the meteoroids, which look like large stones, or may be even less. The classification is based on the assertion that asteroids can survive when entering the Earth's atmosphere and reach the surface, while, as meteors usually burn up completely in the atmosphere.
Comet - (from the Greek. - "Hairy, shaggy") - a small celestial body that has a foggy look, orbiting the Sun usually elongated orbit. When approaching the sun comets coma and sometimes a tail of gas and dust. Presumably, long-period comets fly to us from the Oort cloud, in which millions of cometary nuclei. Body located on the outskirts of the solar system, typically composed of volatile substances (water, methane and other ices), evaporating while approaching the Sun.
Meteorika (meteor astronomy) - branch of astronomy, studying the motion of meteoroids and their interaction with the atmosphere of a fall to Earth, the composition and other properties of meteorites.
Meteorites are classified into
three main types:
Stone - chondrites.
Zheleznokamennye - pallasity.