Walkabout the Galaxy
Astrophysics and Astronomy | Physics
Mars has a thin atmosphere, so little changes in the weather, even breezes, make big relative changes in how sound travels. We speculate on the sounds of future baseball game on Mars before turning to a fortuitous glimpse of the light from an individual star when the universe was less than a billion years old.
Index of Refraction
Neatly capturing both the phase velocity of light and the absorptive properties of material, the index of refraction is your one-stop shop for understanding the propagation of electromagnetic waves through medium. If you need to check the speed of light through your material, just check the real part of the index. Let your imagination run wild with the imaginary part to see how much light is absorbed. Now available with special real values less than one, and negative values to enable you to venture beyond the refraction limit. The index of refraction, let your fingers do the walking (Yellow Pages).
© Joshua Colwell, All Rights Reserved
Length of Episode
Colwell, Joshua; Dove, Adrienne; Sargeant, Hannah; and Cooney, James, "The Sounds of Mars and the Lights of the Earliest Stars" (2022). Walkabout the Galaxy Podcast. 199.