How can wellbeing be defined? what terms and levels are used to describe wellbeing? how does the level of wellbeing relate to a country’s level of development?

Well-being is a positive outcome that is meaningful for people and for many sectors of society, because it tells us that people perceive that their lives are going well. Good living conditions (e.g., housing, employment) are fundamental to well-being. Tracking these conditions is important for public policy. However, many indicators that measure living conditions fail to measure what people think and feel about their lives, such as the quality of their relationships, their positive emotions and resilience, the realization of their potential, or their overall satisfaction with life.

Hope i helped :)

The answer is the magnetosphere.