Meteorite "نيزك"

Comets
Origin
Not well known
Form at great distance from the Sun
Most famous short-period comet is Halley’s comet
76 year orbital period
Potato-shaped nucleus (16 km by 8 km)

Meteoroids
Called meteors when they enter Earth’s atmosphere
A meteor shower occurs when Earth encounters a swarm of meteoroids associated with a comet’s path
Meteoroids are referred to as meteorites when they are found on Earth
Meteoroids are referred to as meteorites when they are found on Earth
Types of meteorites classified by their composition
Irons
Mostly iron
5–20 percent nickel
Stony
Silicate minerals with
Inclusions of other minerals
Meteoroids are referred to as meteorites when they are found on Earth
Types of meteorites classified by their composition
Stony-irons – mixtures
Carbonaceous chondrites
Rare
Composition – simple amino acids and other organic material

Meteoroids are referred to as meteorites when they are found on Earth
Types of meteorites classified by their composition
Carbonaceous chondrites
May give an idea as to the composition of Earth’s core
Give an idea as to the age of the solar system