This chapter explores the special relationship between the Earth and the Moon, discussing the prevailing giant impact theory and its flaws. It introduces a new theory that suggests the Moon formed inside an early Earth that resembled a huge vaporous cenestia, explaining the similarity between the two. The chapter also discusses the significance of the moon forming giant impact in the history of Earth and its potential contribution to Earth's habitability.
The term can refer to a double, a ghost, a shadow. But it can mean much more. From our online mirror world, to digital simulators, to the Earth's twin--TED speakers learn from the uncanny second self. Guests include author Naomi Klein, aerospace engineer Karen Willcox, planetary scientist Sarah T. Stewart and psychologist Nancy Segal.
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