Define and give an example of coevolution.
1.1 To understand the universe, astronomers use the laws of physics to construct testable theories and models Scientific method: approach based on fundamentally on observation, logic and skepticism Requires that our ideas about the world around us be consistent with what we actually observe 1. Hypothesis: collection of ideas that seems to explain what is observed Must always agree with existing observation unless the scientist thinks existing results are wrong and can give compelling evidence to prove it Scientist then uses logic to work out implications of the hypothesis and make prediction that can be tested Only on firm ground after it has accurately forecast the results of new experiments or observations 2. Models: hypotheses that have withstood observational or experimental tests Tells us about the properties and and behavior of some object or phenomenon Ex. model of atom: electrons orbiting a central nucleus 3. Theory: a body of related hypotheses pieced together in a selfconsistent description of nature Ability to make predictions that can be tested by other scientists If predictions are verified, theory might be correct If unable to verify, theory needs to be adjusted or replaced entirely An idea that can’t be tested by experiment or ob
