1. how do scientists study objects in space that are at vast distances from earth? 2. what types of evidence enable scientists to make inferences about the sizes, temperatures and distances of stars? 3. how are scientific inquiry and engineering design interrelated in the field of astronomy? 4. how might new instruments and tools astronomers expand their knowledge of the universe? 5. how do astronomers interpret lines of evidence to support a theory that explains the formation and history of the universe?