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No, they didn't.
The ashes of Clyde Tombaugh, the astronomer who discovered Pluto in 1930, are aboard the New Horizons spacecraft. After his death in 1997, a small container with his ashes was attached to the spacecraft as a way to honor his role in the exploration of the distant dwarf planet.
Albert Einstein's ashes were scattered in an undisclosed location, as per his wishes. Some of his brain tissue samples are preserved for scientific research and study.
Albert Einstein was cremated, and his ashes were scattered in an undisclosed location as per his wishes.
Gene Roddenberry's ashes were carried into space aboard a Pegasus XL rocket in 1997. The rocket was launched by the company Celestis, which offers memorial spaceflights for cremated remains.