Question

which planet is known as blue planet

Answer 1

hey friend your answer is here...
our planet earth is known as the blue planet as it is surrounded by water

hope it helps you
plz follow me guy's

Answer 2

Earth is called the Blue Planet most often because it’s surface is mostly water which together with the atmosphere creates blue light, is a pale blue dot when viewed from billions of miles away, and because, well, everyone you encounter lives here.

Neptune is still bluer though.