planetary

On a rainy afternoon , Sara and Tom sat by the window and watched a short documentary on a laptop . The film explained planetary motion and how missions to other worlds are planned . They have been reading short articles about Mars and the Moon , so the documentary helped them understand the ideas better . If they had more time , they would join a local astronomy club to see the night sky through a telescope . Although the program was brief , interesting images were shown and they felt inspired to learn more .