Game of Life receptor

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I am looking for an interesting structure in the game of life.

If left alone, it shouldn't expand a lot(Still lifes or oscillators are allowed), but if we add an life somewhere, it launches an rocket.

Link to the Wikipedia page: THE GAME OF LIFE

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It's possible to combine Gosper glider guns so the gliders annihilate each other (together they would constitute an oscillator), but if another glider comes in at the right moment it creates a spaceship.

Look at the middle bottom of this gif, where three glider guns and fishhooks just oscillates until the one movement that moves along the racetrack comes along and makes a spaceship.