Question

Community or collection of stars is called:
A) Solar system
B) Galaxy
C) Planet
D) Milky Way

Answer 1

Hint: Before discussing a community or collection of stars, we should know what stars are. A star is a heavenly body consisting of a luminous sphere of plasma held together by its gravity. A star emits light due to the fusion of hydrogen into helium in its core, releasing energy that travels through the star's interior and then radiates into outer space.

Complete solution:
A galaxy is a system of stars, interstellar gas, and dark matter such as black holes bound together by gravity. Galaxies were initially discovered with the help of telescopes and were given the name of spiral nebulae. A large number of galaxies are categorized into groups, clusters, and superclusters. The word galaxy comes from the word galaxias(of Greek origin), which means milky. It is a reference to the Milky Way, the galaxy where we exist.

Hence we can now say that a community or collection of stars is generally called a galaxy and the correct option is (B).

Note: Let us take a look at what the other options mean, and why they were not the correct answer. The Solar System is the system of the Sun and the heavenly bodies that orbit it and hence refers to a particular star. A planet is a celestial body revolving around a star that is massive enough to be held by its gravity but is not massive enough to cause fusion. The Milky Way is the galaxy that contains our Solar System and as such, refers to a particular cluster of stars and celestial bodies.