Deciphering The Vast Scale of the Universe | STELLAR
Summary
This PBS Space Time episode explores the history of discovering the universe beyond the Milky Way, focusing on Edwin Hubble’s 1924 proof that Andromeda is a separate galaxy. The narrative highlights the critical role of Henrietta Leavitt’s discovery of Cepheid variables, which allowed Hubble to measure cosmic distances and later reveal the expanding universe. The segment transitions to the Hayden Planetarium, using a digital simulation to visualize the vast scale of the cosmic web and our place within the Laniakea supercluster.
Topics discussed
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Introduction to the scale of the universe
Edwin Hubble's discovery at Mount Wilson Observatory
Early observations of spiral nebulae and Vesto Slipher
Hubble's methods and the challenge of measuring distance
Henrietta Leavitt and Cepheid variable stars
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Determining the distance to the Andromeda Galaxy
The expanding universe and the Big Bang
Exploring the digital universe at the Hayden Planetarium
Journey through the Milky Way and Local Group
The cosmic web and Laniakea supercluster
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Modern observatories and the legacy of Hubble's work
Draper Hack the Moon and the Fermi Paradox
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