In any Traveller campaign, some worlds are denoted as having Red Zone status. Whatever the reason behind that status might be, you can bet that Referees can use it to create interesting adventures, and player-characters can find some excuse to visit the place just to see what's there. In order to assist the weary Referee, I've provided the following Red Zone Reason table to help provide playable explanations for this particular status code. As always, your Traveller Universe may be different from mine regarding certain underlying assumptions. If you come across an entry that doesn't seem to fit your needs, please feel free to change it for your own personal setting development.
Table: Red Zone Reason
d66 Red Zone Reason 11 Astrogation Hazard 12 Automated Defenses 13 Cultural Study 14 Dangerous Parasites 15 Displaced Species 16 Electronics Disruption 21 Extreme Gravity 22 High Radiation 23 Infectious Cannibals 24 Jumpspace Rupture 25 Life-Hating AI 26 Local War 31 Man-Eating Monsters 32 Military Stronghold 33 Naval Shipyards 34 Political Prisoners 35 Power-Draining Predators 36 Primitive Species Preservation 41 Progenitor Site 42 Psionic Wildlife 43 Psionics Institute 44 Ravenous Pests 45 Religious Fanaticism 46 Research Station 51 Secret Project 52 Sovereign Estates 53 Space Creatures 54 Terraforming Failure 55 Trade Embargo 56 Treaty Clause 61 Unexploited Reserves 62 Virulent Pandemic 63 Weapon Testing 64 Wildlife Preserve 65 Xenophobic Elder Race 66 Referee's Choice (Something Unusual)
Wow! That took longer to put together than I thought. I hope it helps, though. I know I'll be using it in future posts here, as well as for my Traveller campaigns in general.