Kepler wrote a book called The Dream (1634), published after his death, that was considered an early work of science fiction. The book was an imaginative story of a voyage to the moon.
Kepler is best known for discovering the three mathematical laws of planetary motion ("Kepler's Laws") that established the discipline of celestial mechanics. He also discovered the elliptical patterns in which the planets travel around the sun.
Johannes had 10 children.They were Katharina Kepler, Heinrich Kepler, Friedrich Kepler, Sebald Kepler, Cordula Kepler, Ludwig Kepler, Margareta Regina Kepler, Susanna Kepler, Fridmar Kepler,and Hildebert Kepler