GENERAL KNOWLEDGE

Detailed explanation-1: -From largest to smallest they are: Universe, galaxy, solar system, star, planet, moon and asteroid.

Detailed explanation-2: -The Universe is the biggest and contains billions of galaxies. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. Our galaxy is called the Milky Way galaxy.

Detailed explanation-3: -The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them! NASA’s telescopes allow us to study galaxies beyond our own in exquisite detail, and to explore the most distant reaches of the observable universe.

Detailed explanation-4: -There are three levels of the stellar system hierarchy: 1) multiple stars and planetary systems; 2) star clusters and associations; 3) galaxies. On a larger scale, galaxies combine into 1) groups; 2) clusters; 3) superclusters; 4) hyperclusters.