Unknown

BEFORE YOU BEAM DOWN: THERE IS A CHANCE YOU WILL SPAWN UNDERGROUND AND DIE BEFORE YOU CAN GET TO THE SURFACE! ALWAYS BRING AN ESCAPE TELEPORTER!

Unknown is an extremely dangerous planet (2-5 environmental hazards, some can be mildly annoying, some are deadly/irresistable). It is composed of randomly chosen biomes (both on the surface and underground), and can have almost any biome in the game (except Aether World biomes, etc.). It is more diverse than other randomized planets (Shadow and Super Dense), and can be of tier 5-10.
 * Outputs of Atmospheric Condenser on this planet are the same as on normal planets (Garden, Eden, etc.), regardless of the primary biome.
 * All species of bees have normal production (no bonus/penalty for biome).

Environmental hazards
All Unknown planets have different hazards. For each planet that you visit, its hazards are revealed when you land on it for the first time.
 * The number of hazards is chosen randomly (2-5). The higher is the planet tier, the greater is the chance of getting more hazards.
 * Severity of hazards (e.g. Mild Cold vs. Extreme Cold) doesn't depend on tier.
 * Only 1 hazard can be chosen from each category (for example, Mild Cold and Extreme Cold are in "cold" category, so a planet can't have both of them at the same time).
 * Some Unknown-only hazards are not blocked by direct immunities. For example, Deadly Cold is not blocked by "Immune to Extreme Cold".
 * They can, however, be blocked by having high resistances (e.g. 80% Cold resistance gives immunity to Deadly Cold).
 * Unknown-only hazard "Overwhelmingly Maddening Atmosphere" can be blocked with 80% Mental Resistance.
 * Some uncommon hazards like  (Intoxicated) and   (Bee Stings) can be blocked by Immunization medical buff (from medical space stations).

Temporal Instability
"Temporal Instability" hazard is unique to Unknown planets. It causes your health/energy/hunger/location to sometimes return to where these values were N seconds ago. Various minor stats (shield health, energy regen cooldown, etc.) are also affected.

There is no immunity to it. Depending on the situation, it may be to your tactical benefit (getting you out of danger, healing you after a major fight, etc.). The downside is that you can't know when it would happen (unlike when drinking Timewinder Schnapps), so it can, for example, return your hunger to "almost starving" shortly after you have eaten.

List of all possible hazards
These are internal IDs of hazards (e.g.  is Mild Cold and   is Extreme Cold).