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Binary Stars (1155)
Instruction:
Place stars into some cells in the grid, no more than one star per cell. Each row and each column must contain exactly one star. Cells with stars cannot touch each other along an edge or a corner.
For any pair of two stars, the midpoint is defined to be the location that is on a straight line connecting the centers of those two stars and is exactly the same distance away from the centers of those two stars. Some black dots are provided on the grid; each one must be a valid midpoint (but can be the midpoint of more than one pair of stars). Not all possible midpoints are given.