Seed is 73153

Pick three points to make a triangle

Oops!

 Do a 3D grid  based on PR#s from a seed; 73153, for example. A grid of points in interstellar space where I derive a PR# from the current point as we move through the grid, where we first ask if there's a star, then where it is up to half a cell in or out, up or down, etc. Then we find out mass, age, luminosity, metals, and everything else. 

I can use the seed to generate a location in some Galaxy, plus or minus a thousand light years Z in the galactic disk, then a radius and angle to get an X and Y. The Galaxy is like ours, about a hundred thousand light years across. Get the square root of the PR# times 50K light years for radius, the a random angle and the depth within the disk. The remainder of three square root of 73153 is .468112723, the square root times 50K is 34209.38186 ly, remainder of square root of 468.112723 is .634912807 times 2 pi is 1.997779003, X is cos(1.997779003) times radius of 34209.38186 ly is something I'll have to plug into some JavaScript in a page. Y is sin(1.997779003) times radius, also in the page. A Z depth of -565 ly from .217311654. Use the XYZ to build a sector 52 ly across, from -26 to 26 around that XYZ.