![]() ![]() Spaceships traveling in other directions and at different speeds have also been constructed in other two dimensional cellular automata. It is known that Life has spaceships that travel in all rational directions at arbitrarily slow speeds (see universal constructor). ![]() Until the construction of Gemini in May 2010, all known spaceships in Life traveled either orthogonally (only horizontal or vertical displacement) or diagonally (equal horizontal and vertical displacement) other oblique spaceships have been constructed since then, e.g. This is expressed in terms of c (the metaphorical "speed of light") which is one cell per generation thus, a spaceship with a period of five that moves two cells to the left during its period travels at the speed of 2c/5. ![]() The speed of a spaceship is the number of cells that the pattern moves during its period divided by the period length. ![]()
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