2. The Speed of Light in Ancient Times

As the speed of light often turns up when discussing space travel, it may seem like a modern question, but scientists and philosophers have been pondering the issue since Ancient Greece. Empedocles believed that it took some time for light to travel from the sun to the earth, but Aristotle disagreed, believing that light traveled instantaneously. Other early thinkers on the topic included Euclid, Ptolemy and Heron of Alexandria who argued that the speed of light is infinite, as objects appear immediately upon a person's eyes opening.

ancient times speed of light thelefty / Getty Images

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