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If it is aliens they are 3billion light years away so we have 3billion years assuming they leave now

true that... but here we have so much expectations with what they look like.. and thats good .. they will feel like welcoming

i ask the question, what will they look like?

umm.. may be like that of a picture which i have their in my mind... a big head... thin lips lines only.. no nose.. big eyes... 2 fingers.. flat legs with no fingers... grey green body... no familier language..

hahahahahaha, what if they appear just like an ameoba

:D then i will imagine them as a mercury like amoeba... my finger will feel jelly when i will touch them... and they will laugh.. wow! they may become a cute intelligent pet then...