Questions 10-13 refer to the following story:In 1682, Edmund Halley studied a bright object that moved in the night sky. After searching other scientists' works, he noted that similar objects were observed in 1456, 1531, and 1607 that followed a similar path. He decided that those objects were, in fact, the same thing he was studying, and that this object passed by the earth roughly every 76 years. He then predicted that the object would be seen again in 1758. On Christmas Day, the object was indeed, seen again. It is now called Halley's comet, and it comes into view of the earth every 76 years.
Regular appearances of Halley's comet have been found in history as far back as 2,000 years ago. Is the existence of Halley's comet a theory or a scientific law?
Since the appearance fo the comet has been noted many times throughout history by many different scientists, the existence of Halley's comet is now a scientific law.