If we find ET, don't talk to it, says the man who wants to find ET
- Written by Charley Lineweaver, Researcher at Research School of Astronomy and Astrophysics and the Research School of Earth Sciences, Australian National University

The question of whether there is intelligent life elsewhere in the universe has been asked by people for many years.
But if we hear something, should we answer? In the absence of any signal from them, should we try to make our presence known?
One of those asking these questions is Stephen...