I'm not sure but I think there is another civilization in other planets too,if i'm not mistaken I think that the Qur'an has said something about another life being in outer space but I think for there to exist another civilization in far far away into the cosmos is possible,but I don't think that we will ever find that civilization,I guess it is one of Allah many secret about this universe,and of course they worship Allah too and I think there's got to be a non believer Alien too.
Whether there is another civilization or not Allah knows best,but who said only in outer space,for all we know there could be another dimesion too,but that is none of our business.The knowledge of the unseen only belong to Allah,he is the all-seeing,the all-wise.
"Say: 'No one in the heavens and the earth knows the Unseen except Allah.' They are not aware of when they will be raised. No, their knowledge respecting the hereafter is slight and hasty. In fact they have doubts about it. In fact they are blind to it. (Surat an-Naml, 65-66)
"They say, 'Why has a Sign not been sent down to him from his Lord?' Say: 'The Unseen belongs to Allah alone. So wait, I am waiting with you.' (Surah Yunus, 20)
Does he have knowledge of the Unseen, enabling him to see? (Surat an-Najm, 35)
Allah knows the Unseen of the heavens and earth. Allah knows what the heart contains. (Surah Fatir, 38)
That is some of the news of the Unseen which We reveal to you. Neither you nor your people knew it before this time. So be steadfast. The best end result is for those who guard against evil. (Surah Hud, 49)
Allahhuakbar!!!!
P.S:I thought you said that you were leaving.