A Matryoshka, or Russian nesting doll, is a set of wooden dolls of decreasing size placed one inside another. It seems an appropriate name for a system containing three moons of a gas giant that regularly collide, and on occasion collide simultaneously.

The system was first visited by Commander Noobdoge, but Commander Regza was the one who first discovered the significance of the orbital data and drew the galaxy's attention to this backwater system.

The three moons of the ringed Class IV gas giant Eoch Flyuae YK-K c10-56 1 orbit closely, approximately 13,000 km from the surface of their parent.

Planet 2, a landable high metal content world, also orbits closely, at a distance from the surface that's barely different from the radius of the gas giant: the barycentre is only 800 km above the surface. This makes for a crowded part of the system, with fast-moving bodies.

The gas giant has two remarkably thin rings, just 4 and 5 km in width. They are invisible and unscannable, though this is not really surprising considering that the rings must pass through bodies 1 b and 1 c.

Another unusual aspect of these moons is that their nomenclature does not match their orbital positions. Body 1 b is the one that's closest to the gas giant, followed by 1 c: 1 a is the farthest one instead.

The orbital inclinations of the three moons differ by only 6 degrees. Their orbits are nearly circular, and the difference between their semi-major axes is less than their combined radii, meaning they are guaranteed to collide on every orbit.

Triple collisions with all three bodies colliding simultaneously are not as frequent.

After 2027, the next collsion will be in 2030.

Planet 1 b has a sulphur dioxide atmosphere, and when it collided in early 3311 it marked the first observation of a planet with a thick atmosphere colliding with a landable body. Observers were shocked to see the planet vanish completely from sight until it re-emerged a short while later.