From LSWiki

Class: Fieldcraft Skills
Attribute: Intellect
Pedagogy: Procedural
Practitioner Term: Aethernaut
Hidden Skill

This skill represents an overall, in-depth familiarity with the terrain of space -- the subtle changes in the microdensity of near
vacuums, how to maneuver in the absence of gravity, the behavior of movement and collisions with no atmospheric friction, and so on. 
When in such terrain, this familiarity aids one in fighting, movement, and the use of a variety of skills, such as tracking, stealth,
foraging, and elude.

Trainers