Exploring Galactic Spectra: From Hubble's Law to Modern Observations

Jun 27, 2025

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Delve into the optical spectrum of a galaxy, Ha & Hb emission lines, Vesto Slipher's redshifted spectra, and Edwin Hubble's groundbreaking discoveries. Learn about the Hubble constant, the age of the Universe, and analogies like the Balloon and Raisin-Bread. Explore the Color-Magnitude Diagram, oldest objects in the cosmos, and the consistency of cosmic timelines.

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Exploring Galactic Spectra: From Hubble's Law to Modern Observations

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Presentation Transcript

Optical Spectrum of a Galaxy Ha Recession velocity = 14387 km / s z = 0.0479 Flux Hb [O III]
Vesto Slipher
Redshifted Spectra
Edwin Hubble
The Original Hubble Law
Modern-Day Hubble Law Today our best value for the Hubble constant is 70 +/- 5 km / s / Mpc.
Balloon Analogy
Raisin-Bread Analogy
Measuring the Ages of the OldestObjects in the Universe Color-Magnitude Diagram for a Globular Cluster The age of the Universe is thought to be 13.7 Gyr. The oldest globular clusters are about 12.6 Gyr old. So things seem consistent!