You have read scientists statistics, we have something in the region of ''75 thousand million million'' stars/suns in our universe and they reside in around 400 billion galaxies the number of planets is uncountable, We are one planet with life and how many more are there? 
We are not alone that is a statistical impossibility, but... How vast is the universe we will never even get out of our one galaxy in our life time until new tech is created but we could have destroyed ourselves by then. Nasa has a world flag because they know something we don't know 
The guy was right above the ''flower of life''
We are not alone that is a statistical impossibility, but... How vast is the universe we will never even get out of our one galaxy in our life time until new tech is created but we could have destroyed ourselves by then. Nasa has a world flag because they know something we don't know The guy was right above the ''flower of life'' I don't think NASA (or any official entity) has chosen this flag to represent Earth - fortunately, because it's quite ugly.
Also, do we actually need a flag? What will it distinguish us from? It's not like we've found any alien life yet, and even when/if that happens, I'm sure there will be a lot more differences than just the colors and patterns in a piece of cloth.
