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Asteroids and comets − articles

 

The small rocky bodies

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Millions of small rocky bodies called asteroids are present in the solar system. If the asteroids were "luminous", we shall see as all stars in the night sky.
A significant portion of them circulate in a ring between the orbits of Mars and Jupiter, between 2 and 4 AU (symbol: AU) The distance averages of the Earth in the Sun. An AU is worth 149 597 871 km. It is a unity often used for the distances in the solar system, or for the space of two stars in a double system. , called the asteroid belt. It marks the boundary between the terrestrial planets and gas giants.

 

An asteroid is a celestial object is not observable to the naked eye, because of its small size which varies from a few tens of meters to several hundred kilometers in diameter and is part of our solar system.
Objects of less than 50 m in diameter are called meteorites. Asteroids are not satellites of planets.

 

These debris of the protoplanetary disk, not being sufficiently numerous and massive, failed to consolidate sufficiently to form a planet, during their building. Asteroids are of great importance in understanding the formation of the solar system, it is for this reason that astronomers show a strong interest in the study of these objects.

Asteroid météorite
Asteroid the threat
for the life...
Meteorite,
extra-terrestrial object...
  
comet hartley 2Collision between two asteroids in 2009
Hartley 2 passes close
to us, every 6 years...
Collision between
two asteroids...
  
Passage of the asteroid 2005 YU55 in 2011Apophis, the next disaster
Shooting asteroid ever
closer to Earth...
Apophis,
the next disaster...
asteroid VestaQu'est-ce qu'un astéroïde ?
Vesta in the light
of Dawn, 2011...
What is a asteroid?
  
Ison comet 2013List of asteroids classified by size
On its first visit,
Ison will be blazing...
List of asteroids
classified by size...
  
Impact craters on EarthAsteroid Ganymed (1036), NEO and March cruiser
Impact craters
on Earth
Asteroid Ganymed (1036),
NEO and Mars cruiser...
 
The Earth-Crossing Asteroids - NEOAsteroids
Earth-Crossing
Asteroids...
Asteroid 2009 DD45
sending us a sign...
  
Where does the water from the Earth?asteroid or comet (Itokawa and hartley 2)
Where does the water
of the planet Earth?
Asteroid or comet?
  
2010 TK7, Trojan asteroid of the EarthTorino scale
2010 TK7, Trojan
asteroid of the Earth...
Classification
on the Torino Scale...
Nice model, the late heavy bombardmentasteroide 2012 LZ1
Nice model, the late
heavy bombardment...
Once again,
we have not seen...
  
Comet Lemmon C/2012 F6 passing in March 2013Asteroid 2012 DA14 passing February 15, 2013
2013 the year
of comets...
135,000 tons of rock
closer to Earth...
  
Simulator revolution and orbits of asteroidsDefinition of astronomical terms in SMS format
Simulator the round
of asteroids...
Astronomical terms
in SMS format...
 
Kuiper beltCeres the largest asteroid
Objects
in the Kuiper Belt...
Ceres the largest
asteroid...
  
comet holmesthe south pole of the asteroid Vesta
the periodic passage
of comets...
South pole torn
of asteroid Vesta...
  
chart of near-Earth asteroids by NEOWISEAreas with asteroids and comets
The chart of asteroids
is less dangerous...
Areas with
asteroids and comets...
comet stardust 2004Orbits of dangerous asteroids
Comets wandering...
Orbits of dangerous
asteroids...
  
Asteroid PallasAsteroid Juno disfigured by a collision
Asteroid Pallas
the 2nd largest...
Asteroid Juno disfigured
by a collision...
  
Rosetta and the cometChariklo asteroid (10199) and its 2 rings
Rosetta has rendezvous
with a comet...
Chariklo and its two
amazing rings...
 
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