SOLAR SYSTEM

Detailed explanation-1: -It has been estimated that 250 asteroids are larger than 100 km (60 miles) in diameter and perhaps a million are larger than 1 km (0.6 mile). The smallest known asteroids are members of the near-Earth group, some of which approach Earth to within a few hundredths of 1 AU.

Detailed explanation-2: -Beyond our Solar System, asteroids travel through the galaxy from system to system. These asteroids do not necessarily orbit a star but stars influence their direction and speed. Many astronomers believe that asteroids are pieces from the origins of the universe.

Detailed explanation-3: -Asteroids aren’t all round like planets. They have jagged and irregular shapes. Some asteroids are hundreds of miles in diameter, but many more are as small as pebbles. Most asteroids are made of different kinds of rocks, but some have clays or metals, such as nickel and iron.

Detailed explanation-4: -Asteroids are rocky, airless worlds that orbit our Sun. They are remnants left over from the formation of our solar system, ranging in size from the length of a car to about as wide as a large city.