About Mirosław Hermaszewski
Mirosław Hermaszewski was a Polish cosmonaut, fighter plane pilot, and Polish Air Force officer. He became the first and, at the time of his death in December 2022, only Polish national to ever go to space when he flew aboard the Soviet Soyuz 30 spacecraft in 1978. He was the 89th human to reach outer space. At the time of the massacre, Hermaszewski was only 18 months old; the youngest victim from his family was 1½ years old, while the oldest—Hermaszewski's grandfather—was 90. He was studying in Moscow at the time and was at first ordered to return to Warsaw when martial law was declared, but after two weeks he was released to continue his studies. Hermaszewski later became President of the Polish Astronautical Society (a position he held from 1986 to 1990).
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.