If the “Wrapping It Up” activity for this chapter included measurements or data, please describe what factors influenced the accuracy of your results. (Do not include mistakes, only unavoidable measur...If the “Wrapping It Up” activity for this chapter included measurements or data, please describe what factors influenced the accuracy of your results. (Do not include mistakes, only unavoidable measurement imprecision.) If you obtained any numerical values for the accuracy of your measurements during the activity, note those here. Based on the measurements you made in this chapter, how do you know that the Universe is expanding (stretching) but the individual galaxies are not?
