Unknown Sites
Unknown sites are usually combat sites with lots of pew pew. Up to and including 0.5 (1.0 to 0.5) you will usually just find frigates with maybe the occasional cruiser, I have never come across anything bigger. In low sec it's usually cruisers and frigs and the lower you go the bigger/badder and nastier they get.
Down to 0.5 you should be able to solo Unknown sites as I managed quite comfortably in a Hawk. If your worried take a couple of friends.
Make sure you have plenty of cargo space to loot and get someone to fit a salvager to get the loot.
Unknown sites have a chance of escalating, what this means is that once you have completed the site you are on another site somewhere else will spawn. To see if a site escalates check your journal - expeditions tab. Then follow to the site and complete, an escalation site will not stay there forever so be sure to get right on it.
Try to complete escalated sites without leaving otherwise it may despawn.
An escalated site may spawn another one and another etc etc.
