Coming from Fox News certainly doesn't make it much more credible. But I don't think it makes it less credible, either. You should figure out whether it's credible based on other evidence. If you think that coming from Fox News "kills all credibility" of something then you are going to disbelieve many true things.

WRT to alien life, FOX has an established reputation:

http://en.wikipedia.org/wiki/Alien_autopsy#Alien_Autopsy:_Fa...

I can still remember my father sitting me down and explaining to me how this was going to change _everything_ about our understanding of the universe.

While my father should have exercised more incredulity, it was pretty irresponsible of FOX to pump the damn program for as much attention as possible.

Certainly not defending 'Alien Autopsy' or FOX News in general as reliable science resources... but that was on FOX TV. It aired in 1995 and FOX News Channel was not established until 1996.

Fox also aired the X-Files! Talk about an agenda!