From The Space Review, Jeff Foust on the exoplanet explosion. Looking for life in the shadows: The search for a second Earth gets serious. The first chapter from How to Find a Habitable Planet by James Kasting. At a Cambridge alien conference, scientists warn of an invisible Earth and hostile ETs. What if the aliens decide they don’t like us? Hello ET, we come in peace: The advantages of advertising our existence to the universe outweigh the risks. Do you speak alien? Stephen Battersby on exolanguage. What aliens really look like: Portrait gallerys of the most common Alien sightings around the world. Extraterrestial Ethics: What obligations do we owe to the various life forms we send there, or those we might discover? According to Michael Mautner, Research Professor of Chemistry at Virginia Commonwealth University, seeding the universe with life is not just an option, it’s our moral obligation. What aliens look like: Will they be super-smart predators, glass-veined acid-dwellers or giant microbial blobs? A look at why extra-terrestrials are likely to possess human foibles such as greed, violence and a tendency to exploit others' resources. From the National Catholic Reporter, the Truth is out there; extraterrestrials, probably not (and a response). Aliens can't hear us: Fainter broadcasting signals and digital switchover mean Earth will soon be undetectable to extraterrestrials. As SETI approaches its 50th anniversary, three books tackle the question of why we have not yet found evidence of alien intelligence. The man who'll welcome aliens: Jon Ronson meets Paul Davies, the scientist with an awesome responsibility. A review of The Eerie Silence: Are We Alone In The Universe? by Paul Davies (and more).