Ep 28. How Do We Know What Stars Are Made Of?

PBS Space Time season 2020 episode 28, titled "How Do We Know What Stars Are Made Of?" delves into the complex process astronomers use to determine the chemical composition of stars. The episode explores the concept of spectroscopy, which involves analyzing the different wavelengths of light emitted by stars to determine what elements are present.

Using clear and concise language, the episode explains how stars are essentially giant fusion reactors that fuse lighter elements, such as hydrogen and helium, into heavier elements. By analyzing the light emitted by stars, scientists can determine which elements are present and the relative abundance of each element. This process also allows them to determine which elements are missing, which can indicate the presence of elements that are not visible in optical light.

The episode takes a deep dive into the technical aspects of spectroscopy, discussing the different types of spectrums and the challenges involved in interpreting the data. It covers topics such as blackbody radiation and the Doppler Effect, which are essential to understanding how scientists use spectroscopy to understand the properties of stars.

The episode also explores the connection between the chemical composition of stars and their evolution. By studying the composition of stars at different stages of their life cycle, scientists can gain insight into the complex processes that drive the evolution of stars, from their birth in nebulas to their eventual explosion as supernovas.

Throughout the episode, the host engages with various experts in the field, who provide insights and explanations into the technical aspects of the science. The episode also features stunning visuals and animations that bring the concepts to life and help viewers visualize the complex processes involved.

Overall, PBS Space Time season 2020 episode 28 is a comprehensive and engaging exploration of how scientists determine the chemical composition of stars using spectroscopy. It is an excellent resource for anyone interested in astronomy and the science behind our understanding of the universe.