2-25 2nd period: Levels of the Universe, 4-6th periods: H-R Diagram- Students will begin to use the H-R diagram to classify star types. 2-26 2nd period: Nebular theory, 4-6th periods: H-R Diagram- Students will describe the evolution of stars from one type to another. 2-27 2nd period: H-R Diagram, 4-6th periods: Early Release 2-28 Solar […]