SOLAR SYSTEM

Detailed explanation-1: -Meteoroids: made of rock and metal, less than 300 meters across. (When a meteoroid enters Earth’s atmosphere, it produces a meteor.)

Detailed explanation-2: -They are among the most ancient objects in the solar system. The S-types ("stony") are made up of silicate materials and nickel-iron.

Detailed explanation-3: -Asteroids are made mostly of rock-with some composed of clay and silicate-and different metals, mostly nickel and iron. But other materials have been found in asteroids, as well.

Detailed explanation-4: -They consist mainly of iron-nickel metal with small amounts of sulphide and carbide minerals. During the decay of radioactive elements in the early history of the solar system, many asteroids melted and the iron they contained, being dense, sank to the centre to form a metallic core.

Detailed explanation-5: -In simplest terms, a meteorite is a rock that falls to Earth from space. Meteorites are rocks, but they are not like Earth rocks. Most are far older, and they provide some of the only samples we have of other worlds – other planets, asteroids and possibly comets – in our solar system.

Detailed explanation-6: -The metallic asteroids are composed of up to 80% iron and 20% a mixture of nickel, iridium, palladium, platinum, gold, magnesium and other precious metals such as osmium, ruthenium and rhodium.