Chapter 6 — Mars, the “Key” to our system

Johannes Kepler famously stated that “Mars is the key to understanding the solar system.” Kepler, of course, notoriously obsessed about Mars for five harrowing years and, in his correspondence with fellow scientists, referred to his relentless pursuit as “his personal war on Mars”. We now know that (presumably out of sheer exhaustion) Kepler eventually resorted
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