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http://eve-myst.info/Universe/Wormholes/

http://eve-survival.org/wikka.php?wakka=HomePage

Cosmic anomalies are ranked in difficulty by 10 levels, these are:
• (Faction) Burrow / Drone Collection (easiest)
• (Faction) Hideaway / Drone Cluster
• (Faction) Refuge / Drone Gathering
• (Faction) Den / Drone Gathering
• (Faction) Yard / Drone Surveillance
• (Faction) Rally Point / Drone Menagerie
• (Faction) Port / Drone Herd
• (Faction) Hub / Drone Squad
• (Faction) Haven / Drone Patrol
• (Faction) Sanctum / Drone Horde (hardest)
A particular anomaly may be further sub-divided into 3 more categories:
• Blood Raider Hidden Hub (easiest)
• Blood Raider Forsaken Hub
• Blood Raider Forlorn Hub (hardest)