Quote Originally Posted by Eric the Half a Bee View Post
Who's to say they'd be able to decipher our radio waves? Who's to say we've got the technology to discover any messages sent from afar? Life on different planets might be so totally different from what anyone could ever predict. We say water is essential for life. Really? How do we know there are other lifeforms and systems that live on, say, rock dust, or some unknown substance or compound that we could never discover?
Or even oxygen,maybe they do not require it