Crater of the pentapodest of the pentapods.

Theory: An egg hatched on a space platform which was headed for Nauvis, but for some reason the platform remained in orbit. The pentapod sustained itself on spoiled cargo until he got so big that he needed more room. He then decided to try move to that nice planet below, not realizing the extent of the fall.

According to a similar post on Reddit:

• A giant mother pentapod,
• the crater of the first pentapod
• Gleba a giant space fruit and it was where the stem was attached
• The Anus™