Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?
1. location where they are formed
2. time they are formed
3. luminosity they are formed with
4. mass they are formed with
5. color they are formed with

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.