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Comets
Considered
in the antiquity like bearers of wars and sventure, these
fascinating viaggiatrici of the space scandito the rhythms of the
human history and have contributed, with their apparitions, to
reveal the mystery of the cosmos. To begin from the observations of
Tycho Brahe, until the most recent discoveries, a report of the
periodic encounter of comets
with the orbits of inner planets, the mysteries of their
composition and their trajectories, the fantastic theories on the
consequences of possible crashs planeta
Asteroids
In the region comprised
between Mars and Giove there is one you wrap of small full of rocks
bodies sayings asteroids.
The first asteroid, Cerere, the first one of January of 1801 was
uncovered from G.Piazzi; others three, Pallas Athena, Giunone and
Vesta were characterize between 1802 and 1807 to you.
Today they have been catalogues to you more than 2000 asteroids.
These are relatively small: largest, Cerere, has a diameter of 1000
Km, but the greater part has dimensions of little kilometers. It is
not still sure the origin of these objects: some cosiderano form
them to you from the disintegration of a planet, while others think
that they are you form to you therefore from the primordiale nebula.
Meteorites
With the term meteorites
those solid bodies agree that enter in the land atmosphere; poichè
they enter with speed comprised between the 40,000 and the 250,000
Km/h become incandescent giving to place to luminous phenomena
sayings meteors.
The meteorites they have several dimensions a lot: from enormous
small masses sassolini or granelli of sand that produces so-called
falling stars.
Every day several tons of meteorites piovono on the Earth, but only
those that have a advanced mass to approximately 100 tons can catch
up the ground.
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