Students use flashlights to determine how scientists use the brightness of a star to determine its distance. Used to help students understand how we can tell that stars and galaxies are moving away from us as evidence for the Big Bang. Not included: lesson plan, PPT, answer key, modified version for SPED or ELL students, or procedure/materialsMS-ESS1-2. Develop and use a model to describe the role of gravity in the motions within galaxies and thesolar system. MS-ESS1-4. Construct a scientific ex