Poetry tells a story and expresses emotion in a way that is concise, emotionally charged, and musical. There are different types like a narrative and lyric. A narative tells a story, which has a plot and characters. A lyric poem is more about feelings and emotions. The speaker is the character.
Maria are large, dark, basaltic plains on the moon. Galileo named these places 'maria' after the Latin word for sea because he thought they looked like oceans.