Science fiction often shows aliens with human features like eyes, limbs, and faces. But science has a reason for questioning ...

Language and radio signals may not matter to aliens. Instead, they might be using patterns to leave a biological fingerprint.

https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!743001~!0#focus ...