Asteroizi dangerous
Bombs from the sky!
Asteroizii are pietroase small objects with
sizes ranging from a few meters and a few hundred kilometers. Most of them are
between orbitele of Mars and Jupiter, forming a 22222w226w belt well defined. Inventariat
were over 10,000 asteroids, of which 3,000 have orbitele known with precision.
The importance of their study is due to the fact that these objects have not
undergone morphological changes from the time of their formation nebuloasa
circumsolara primordiala. As a result, asteroids can give us information about
the beginnings of our solar system.
A special category asteroids that
formed a closer orbit than land, so-called NEO (Near Earth to the acronym
Objects - near-Earth objects). These asteroids have orbite what intersecteaza
with the Earth, there is a theoretical possibility ciocnirii them with our
planet. NEO objects from the belt of asteroids, following perturbation caused
by the planets Jupiter and Mars. The phenomenon of resonance change the orbit
of asteroids from the belt. Alungindu is increasingly more, traiectoriile these
objects meet at a time orbit land. Modern techniques allowed the observation,
lately, has identified dozens of objects small NEO, which has a real psihoza
related event of a collision with catastrophic effects.
It is true that the moon and planets
telurice have suffered in the past, such collisions, martore being craterele
impact, which can be found on the surface of these bodies ceresti. On Earth
have been identified 15 craters with diameters larger than 50 km. The largest
crater (Chicxulub, discovered in 1990) is located in Yucatan peninsula and has
a diameter of 200 km, the impact of an asteroid survenind end cretacicului. The
energy released was 105 megatone of TNT!
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