How did the planets form?
At one time, scientists thought that our solar system might have been caused by an accident. This theory was discarded a generation ago, and in the light of new evidence several new theories have been suggested. Nowadays most scientists suspect that the birth of a solar system may be not at all unusual, and the heavens may teem with stars that have orbiting planets. Mankind is a curious fellow always seeking the answers to his endless questions. Our remote ancestors did not have the skills or the tools to find all the answers they wanted. So they used their imaginations to invent explanations to satisfy their curiosity. The world, they thought, was flat. Same said it sat on the back of a big turtle; others said that it was held on the shoulders of a giant. Modern science, of course, uses more Sensible methods to solve its problems. Facts and more facts are gathered and proved. Someone gets an idea, a theory, of how the known facts may or may not be related. Still more tests are necessa
