Go to content Go to menu
 


Wikipedia

Meteorite

meteorite is a solid piece of debris from an object, such as a cometasteroid, or meteoroid, that originates in outer space and survives its passage through the Earth's atmosphere and impact with the Earth's surface or that of another planet. When the object enters the atmosphere, various factors like friction, pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate that energy. It then becomes a meteor and forms a fireball, also known as a shooting/falling star; astronomers call the brightest examples "bolides." Meteorites that survive atmospheric entry and impact vary greatly in size. For geologists, a bolide is a meteorite large enough to create a crater.

Meteorite
Namibie Hoba Meteorite 05.JPG
The 60-tonne, 2.7-metre long Hoba meteorite in Namibia is the largest known intact meteorite.

Meteorites that are recovered after being observed as they transit the atmosphere or impact the Earth are called meteorite falls. All others are known as meteorite finds. As of April 2016, there were about 1,140 witnessed falls that have specimens in the world's collections.[1] There are more than 38,660 well-documented meteorite finds.[2]

Meteorites have traditionally been divided into three broad categories: stony meteorites are rocks, mainly composed of silicate mineralsiron meteorites that are largely composed of metallic iron-nickel; and, stony-iron meteorites that contain large amounts of both metallic and rocky material. Modern classification schemes divide meteorites into groups according to their structure, chemical and isotopic composition and mineralogy. Meteorites smaller than 2 mm are classified as micrometeorites. Extraterrestrial meteorites are such objects that have impacted other celestial bodies, whether or not they have passed through an atmosphere. They have been found on the Moon[3][4] and Mars.[5]

 

 

 
Naming

 

 
Fall phenomena

 

 
Meteorite types

 

 
Meteorite chemistry

 

 
Meteorite recovery

 

 
Meteorites in history

 

 
Meteorite weathering

 

 
Notable meteorites

 

 
Notable large impact craters

 

 
Notable disintegrating meteoroids

 

 
See also

 

 
References

 

 
External links