Johannes kepler was a german astronomer who lived in the 17th century. he was the first scientist to accurately describe the motions of the planets around the sun with mathematics. more than 50 years after his death, an english physicist named isaac newton developed a mathematical theory of gravity that applied to all objects, not just planets. the example described above suggests that a. scientific knowledge is never correct because it is constantly changing as new theories are developed and discoveries are made. b. scientists who make contributions to scientific knowledge often come from different backgrounds and live at different times. c. scientists tend to all come from the same region and live during the same time period. d. scientific knowledge does not change through time because the earliest scientists were totally correct.