Sara Seager is revealed to be an astute practitioner of metaphor as both a form of reasoning and illustration as well as a source of artful emotional resonance. So thoroughly, in fact, is this memoir steeped in metaphor and analogy, a proper reference point for Seager’s style not that of Humboldt or Sagan, for whom an analogy is drawn up periodically to establish a particular point, but rather that of Charles Darwin, for whom analogy is found to be at the root of his entire system of thought.