Big Blue Marble is a term used to describe the Earth. The term became popular since the famous photograph 'Blue Marble' was taken by Apollo 17 astronauts. It is often used to highlight the stunning beauty and majesty of Earth from space. There are many synonyms to describe the earth, such as 'home planet,' 'the world,' 'the blue planet,' 'terrestrial globe,' 'cosmic orb,' etc. As humans, we must always strive to preserve the natural beauty of Earth, which is a unique and precious planet, full of life and diversity. It is our collective responsibility to take care of it for future generations.