Main Damage type to protect against enemy:

Guristas - Kinetic & Thermal
Serpentis - Thermal & Kinetic
Mordus - Kinetic & Thermal
Blood - EM & Thermal
Sansha - EM & Thermal
Angel - Explosive, Kinetic, Thermal & EM
Mercenary - Kinetic, EM, Thermal & Explosive
Rogue Drones - Explosive, Kinetic, Thermal & EM

Main Damage type to shoot at the enemy:

Guristas - Kinetic
Serpentis - Thermal
Mordus - Thermal & Kinetic
Blood - EM
Sansha - EM
Angel - Explosive
Mercenary - Thermal
Rogue Drones - EM
Eom - Kinetic

Life Text Text Meaning
not yet begun more than 24 hours
beginning to decay between 24 and 4 hours
reaching the end less than 4 hours
on the verge minutes
Mass

The third sentence tells you how much mass has passed through the wormhole.

This wormhole has not yet had its stability significantly disrupted by ships passing through it
This wormhole has had its stability reduced by ships passing through it, but not to a critical degree yet