The universe is unimaginably and infinitely big. It is commonly defined as the the totality of everything that exists or is known to exist.
The universe consists of galaxies, planets, stars, meteorites, satellites and many other things.
Our earth is a part of solar system, which is a part of the Milky way galaxy.
Learn about our earth, the solar system - the sun and other planets and stars.
A SmartTest on Our Universe
Learnhive Lesson on Our Universe