Earth is a planet in the Milky WayGalaxy and our solar system. It is the only planet that can support life. It is the third planet from the Sun and takes 365 days to complete an orbit around it.
From space, Earth looks like a blue planet with chunks of green spread across it. Also, it is covered by smuges of white, but only at times. This is how it derived the nickname "The Blue Planet". This is an odd nickname however, since there are much bluer planets like Neptune.