Planets that support life and aliens etc

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MemberOvomorphMay 23, 2012935 Views10 RepliesSorry guys, kinda lost my marbles a bit on this one. In Prometheus, have they already discovered planets? and ETslife forms? or is this the 1st? as it shows in what holloway says in his talk to the crew WHEN they arrive at the moon.
And is this the case in ALien? have we already travelled to diff planets and discovered nerw life forms? i know its mentioned in Aliens but thats way into the future right? 57 years after Alien? so over 80 years AFTER Prometheus? i remember it being mentioned over 300 surveyed planets? when Ripley is being questioned? and also the marine mention a species they get it on with when having dinner after hyper sleep?