About a space observatory.

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Chapter 6, Problem 45EAP

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Johannes Kepler worked as an assistant to the observatory of Brahe at the age of 27. Brahe collected astronomical observations, which were passed into Kepler, on his death. Among the significant contributions of Brahe: 1. His observations on the planetary motion of Mars were used by later astronomers, including Kepler to construct the present model of the solar system. 2. In 1572, he observed supernova as a star that appeared suddenly, became visible for 18 months before it faded from view. Nowadays, supernova is called an exploding star. 3. In 1577, he observed a comet by measuring its parallax. His claim contradicted the idea of Aristotle that comets are "gases burning in the atmosphere." By measuring the parallax for the comet, he was able to show that the comet was further away than the Moon. 4. His findings that stars do not have parallax, he concluded that either: (a). the earth was motionless at the center of the universe; or (b). the stars were so far away that their parallax…