Nature of Science 101 Last updated Save as PDF Page ID185294 To Do To Answer Read about evidence in science Define direct evidence and indirect evidence. Do scientists use direct or indirect evidence? Explain. Do astronomers use direct or indirect evidence? Explain. Know the definitions (you only need pages 1 and 2) Define theory, hypothesis, observation and law, as they pertain to science. How are each of these words used in science? How is the word "theory" often misused by non-scientists?