Quest Lecture Series Episode 9: Cosmology and Multiple Universes

This talk provides an overview of the current "Lambda CDM" model of cosmology, which takes into account cold dark matter (the CDM part) and the cosmological constant (lambda). We cover dark energy, dark matter, the cosmic horizon and the curvature of the spacetime of the universe. We also talk about "stuff" that came into being during the Big Bang, but which lies forever beyond our cosmic horizon. This leads to a brief discussion of multiple universe theories, including the thermodynamic, quantum, and inflationary universes. Finally, the season of Quest lectures concludes with a brief essay about the relevancy of science and a scientific perspective.