GENERAL KNOWLEDGE

Detailed explanation-1: -Astronomers classify galaxies into three major categories: elliptical, spiral and irregular. These galaxies span a wide range of sizes, from dwarf galaxies containing as few as 100 million stars to giant galaxies with more than a trillion stars.

Detailed explanation-2: -The smallest of galaxies contain a “mere” few hundred million stars while the largest galaxies contain up to one hundred trillion stars! Scientists have been able to segment galaxies into 4 main types: spiral, elliptical, peculiar, and irregular.

Detailed explanation-3: -In fact the spiral galaxies are sub-divided into two groups-normal spirals and barred spirals. The most important difference between these two groups is the bar of stars that runs through the central bulge in barred spirals.