![]() ![]() ![]() This showed that some planetary objects orbit others, leading people to accept that the Earth revolved around the sun.Ĭhapter 2 discusses the modern concepts of space and time. ![]() In the early 1600s, Italian scientist and philosopher Galileo Galilei discovered that moons orbited Jupiter. He also believed the Earth was at the center of the cosmos. He is the first to assert that the world is round, a concept that was controversial at the time. Ancient Greek philosopher Aristotle deduced features of the universe based on his observations of natural phenomena. Hawking incorporates rhetorical questions and humorous asides in a friendly, approachable tone.Ĭhapter 1 focuses on humans’ earliest conceptions of the universe. Hawking writes A Brief History of Time in the first-person present tense to craft an accessible history of theoretical physics. The eBook version of the updated edition forms the basis for this study guide. A number of diagrams, graphs, and illustrations accompany the text the ones most relevant to the guide are described in the summaries below. The 2009 edition contains a forward by the author, which replaces the forward written by Carl Sagan included in the original 1998 edition, and an appendix that updates the science described in the book. ![]()
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