Meaning of Asteroid

what is asteroid:

As asteroid are called small celestial bodies that circulate around the Sun in an inner orbit of Neptune. Since they have a dimension less than on a planet, they can be also called planetoids or minor planets. The word comes from Greek and is composed of ἀστηρ (aster), which means ‘Star’, and ειδής (eidos), ‘form’, ‘appearance’, from there which is also used as an adjective to refer to a thing with form or figure of star.

There are millions of asteroids in our Solar system, mostly located between the orbits of Mars and Jupiter, also known as asteroid belt. Not always have a spherical shape, and its size can range from 500 km in diameter (the largest, Pallas and Vesta) and 50 m (children).

Asteroids are designated according to a catalog number, whose list is ordered chronologically according to the date of discovery, and are often baptized with names from Greek mythology. Thus, for example, we find the Group of Trojans, formed by asteroids whose names were taken from the heroes of the Trojan war. Other groups of importance in the study of astronomy are Centaurs, located on the outside of the Solar system, and because of its proximity to Earth love, Apollo and Aton, groups.

There are various theories about the origin of asteroids. One of them says that they aren’t but the remains of a planet torn by the enormous attraction of Jupiter, other concerns that asteroids could be fragments of the original nebula that were never reunite and become a planet, and that there is also the related to comets.

The nearby asteroid passage as the 2000 M26, 2003 QQ47 or 2012 DA14, have placed alerts on chances of collision with the Earth, marked for March 2014 or 2016, although they are minimal.

In the literature, the most famous asteroid is the B 612, that of where is originating the little Prince, character in the book by Antoine de Saint – Exupéry.

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