I think KSP can't simulate Gargantuan system. It seem to need super awesome/realistic gravity simulation & multiple sun/multiple blackhole/multiple neutron-star for spaceship navigation at near light speed. Here's an extract from the book: ("Science Of Interstellar" by Astrophysicist Kip Thorne (gulp!)). Gargantuan: -100 million solar mass -the horizon CIRCUMFERENCE works out to be approximately the same as the Earth’s orbit around the Sun: about 1 billion kilometers. -Gargantua’s RADIUS, in (event horizon) sense, is about 150 million kilometers, the same as the radius of the Earth’s orbit around the Sun. -huge slowing of time requires Gargantua to spin almost as fast as the maximum (speed of light)...to spin no faster than about 0.998 of the maximum Miller planet: -100ms orbit, really near horizon -giant buldge toward gargantuan -not quite locked to Gargantua. rock back and forth (1 hour period) relative to Gargantua by a small amount -1.2-kilometer-high waves -the entire accretion disk should be outside the orbit of Miller’s planet. - trip from (Endurance at) Parking orbit -to-> Miller planet took Ranger 2 1/2 hour - Endurance move at c/3, where c represents the speed of light. Miller’s planet moves at 55 percent the speed of light, 0.55c. - huge speed changes, c/3, required gravitational slingshots around black holes far smaller than Gargantua. - Stars and small black holes congregate around Gargantuan - the deflector must be a black hole at least 10,000 kilometers in size (about the size of the Earth)... weighs about 10,000 solar masses (IMBH) Mann planet: -orbit highly elongated -outer part of orbit: 600 Gargantuan radii or more -"The whirl of space near Gargantua makes the planet fly around Gargantua once or twice on each swing by, and makes its orbit precess through a large angle from one outward excursion to the next" - trip from Gargantuan to Mann require 2 slingshot (from parking orbit) - speed of the planet is roughly c/20, the first slingshot must accelerate the Endurance up to nearly c/2. (find & use intermediate sized black hole: IMBH) - once the 1st slingshot is completed, the trip to Mann’s planet, with speed about c/2 initially and gradual slowing to roughly c/20, will take roughly an additional forty days. - second slingshot, near Mann’s planet, Endurance swings around a suitable IMBH and gentle rendezvous with the planet Endurance: - explosion sets the ring spinning so fast that its modules feel 70 gees! Earth: - the Earth’s gravitational pull in North America weakened a bit, and in South Africa it strengthened! Edmund planet: (after Mann planet) - (Cooper) lifts the Endurance high enough for Gargantua’s huge tidal forces to pry it away from the planet, sending it on a separate trajectory - (analogy trying to explain something complicated: ) "The Endurance, after being pried away from Mann’s planet, is like a tiny marble that rolls freely on this granite surface. As it rolls inward toward the moat, the marble picks up speed, because of the surface’s downward slope. It then rolls up the volcano’s side, slowing as it goes, and arrives on the volcano’s rim with some residual circumferential motion. And it then rolls around and around on the rim, delicately and unstably balanced between falling inward, into the volcano, and falling back outward and down to the moat." - "Because the critical orbit is so unstable, a small rocket blast is sufficient to send the Endurance off it" (to Edmund) (at any direction!). - (no Edmund orbit specified)