GEOLOGY

Detailed explanation-1: -Astronomers classify galaxies into three major categories: elliptical, spiral and irregular.

Detailed explanation-2: -The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC (New General Catalogue) 598.

Detailed explanation-3: -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-4: -Spiral galaxies are mostly large, elliptical are mostly small in size. The most famous irregular galaxies can be seen with the unaided eye. Irregular galaxies generally have young stars, elliptical galaxies have old stars, and spiral galaxies have both young and old stars.

Detailed explanation-5: -There are four main categories of galaxies: elliptical, spiral, barred spiral, and irregular.