Gravity Well
Gravity Wells are a game mechanic on Horizon's End.
A gravity well is generated either by a static body of mass, such as a star or planet, or by a ship or NPC nest.
Gravity well strength
If a ship is within a gravity well of strength greater than the players jump strength, the player's ship cannot jump through that gravity well.
All planets & stars have a well strength approaching 1,000,000.
As of right now, all Tech 1 capital & subcapital player ships have a well strength of 1, while Tech1 supercapital class starships have a gravity well strength of 2.
The Interdiction Gunship has a well strength of 1, Interdiction Corvette has a well strength of 2 and the Interdiction Destroyer has a well strength of 5. All other Tech 2 ships follow the same pattern as Tech 1 ships, with Gunship through Destroyer having a well strength of 1 while Cruisers and Lancers having a well strength of 2.
NPC Loci also have a strength of 1 (needs verification).
Battlecruisers, barges & cruisers have a jump strength of 2, while all other player ships have a jump strength of 2.
Natural Well Sizes
All stars, and Horizon, have a gravity well with a radius of 1800.
All planets have a gravity well with a radius of 1000.
NPC nests generate a gravity well with a radius of 1500.
Alien "Watcher" NPCs, Teraliths and Verdoliths spawned by the nest generate a gravity well with a radius of 2400. Arborealiths generate a large gravity well of around 3000 blocks.
Defunct Mechanics
This Mechanic is no longer in use with the advent of Disruptors for non-interdiction-class ships, which use a different set of numbers than this. That being said the graph is useful should the need arise for something similar.
Artificial Well Sizes
Ship well radius is determined by a formula.
Civilian Ships
((3000 / sqrt(12000)) * sqrt(block count)) / 2
Warships
(3000 / sqrt(12000)) * sqrt(block count)
Starfighters, Interceptors, Shuttles, Speeders, and Platforms are incapable of creating a gravity well.
The equation can be visualized using this graph: