Larry Bartoszek joins us from the Chicago Society for Space Studies for a program about astronomy and the periodic table. Larry will start with the origin of atoms. He'll show how electron shell structure is related to the emission of light of varying wavelengths and how the light from distant atoms in galaxies changes as they recede. We'll see how spectroscopy leads to the expansion of the universe and its acceleration, now thought to be caused by Dark Energy. All of this comes from an understanding of the unique “fingerprints” of the light emitted by atoms.