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Gr 3–6—Using scientific principles and reasoning, Aguilar speculates on seven potentially cataclysmic events that could happen to Earth, ranging from asteroid strikes to alien invasions. Aguilar relates his hypothetical scenarios to real-life events when possible; for instance, the chapter on comets includes a discussion of the probable comet impact in Tunguska, Siberia, in 1908. The content is chilling, compelling, and clearly explained. Aguilar does take measure to reassure read...Log In or Sign Up to Read More

Planetary bodies have shelf lives, and their obliteration can be caused by a number of astronomical events, such as the expansion of stars o...Log In or Sign Up to Read More