The particles were first sighted near a lifeless planet1). In his never-ending fight against the creeper, Skarsgard Abraxis came upon this new menace during a direct confrontation with the Loki. Unfortunately the Particle emitters were destroyed during the battle, and as such there is little additional information available at this time.
The second sighting of the Particles occurred near the fossil remains of TonyStark2), a gigantic, planet-eating space monster which drowned under massive amounts of Creeper. At this current time Lia is processing data obtained from this battle to better understand the particles.
It is currently unknown whether this was some natural process corrupted by the Loki or if the Particles were designed specifically to torment Abraxis. The Particles emitters seem to favor a habitat of empty space. The Particles themselves have an apparent interaction through modified gravitational wells, and deliver Creeper to the first solid object they touch.
So far the only known defense against these particles is the Beam. Sniper instead beam is defence in some particle maps. The Particle emitters appear to be vulnerable to both beams and nullifiers.