As if it needs to be pointed out, the Bible's not a science book.
No, I don't think it would have been mentioned. When Genesis was written, people would have had a difficult time dealing with the concept of stars, orbits, and so on. Besides, life on other planets has nothng to do with the message and purpose of the Bible. The Bible is totally decoupled from such things; and, has nothing to say either for or against life in other places.