A NY Times science journalist asked me whether there are any good papers, blogs, talks, etc from EA people on possible X-risks from the Search for Extraterrestrial Intelligence (SETI) or active Messaging to Extraterrestrial Intelligence (METI). They're interested in doing a feature piece on this.
I wrote a bit about this in a recent paper (https://www.primalpoly.com/s/Todd-Millerevpsych-of-ETIBioTheory2017.pdf), but haven't kept up on EA writings about possible downsides of alien contact.
So far, the most relevant work seems the Nick Bostrom paper on 'Information Hazards'? ( https://nickbostrom.com/information-hazards.pdf )?