Lots of these sites like publicity, so you could actually get in contact with email...there is usually a link to it on their site...and request whatever it is that you wanted to use and offer to post their link on you site and vice versa...I have done it several times in the music sites...but to be actually honest...
There are thousands of sites that probably have similar stories that you could use and it would be tough for someone to find out...whether of not it is illegal, who knows...but if a host really wanted to keep the info to themselves, they would lock the site to prevent "stealing" images and info and stuff...so it is up to you. Best bet, be safer than sorry.
As far as UFO sightings, I can't say that I have ever been involved with anything of that nature, but I am sure it won't be long til someone comes in here and tells you what you want to hear...
Good luck with your site.