Why do comets and asteroids move
Confusion can easily arise in the realm of the heavenly bodies.
Asteroids, meteoroids and comets are some of the small bodies that orbit our sun. Due to insufficient mass and gravity, they do not take on a spherical shape. The earth orbit cruisers among them, also called NEOs (Near-Earth Objects), are observed by teams of experts around the world, as they can go on a collision course with the earth. Asteroids are star-like rock formations. Around 685,000 are currently known. Only a few reach more than a few hundred kilometers in diameter. Most of them are located in the asteroid belt between the orbits of Mars and Jupiter. Asteroids are holdovers from the formation of the solar system. So do comets: In addition to loose rock, they also consist of frozen gases and water. The "dirty snowballs" move in the Oort cloud or in the Kuiper belt. Occasionally they are thrown off course by passing stars. In the vicinity of the sun, the gases sublime and drag dust particles with them. This cloud, known as a coma, is elongated by the solar wind: a comet's tail of up to 100 million kilometers in length can arise.
The meteoroids are only a few millimeters up to several meters in size. They are smaller than asteroids, but there is no clear distinction between chemical composition and size. They arise, for example, when the gravity of planets tears them out of an asteroid belt, the solar wind knocks them out of cometary nuclei or when two asteroids collide. When they enter the earth's atmosphere, they are called meteors, also popularly known as falling stars, because the charging of the air particles creates a glow. They become meteorites if there is also an impact on the earth. Their enormous impact speed of several kilometers per second and the resulting pressure wave can cause immense damage.
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