Astronomy Cast

Wizzard Media

Science & Medicine, Natural Sciences

Chart Positions

Natural Sciences 11
Science & Medicine 27

Astronomy Cast brings you a weekly fact-based journey through the cosmos.


Ep. 165: Doppler Effect

November 23rd, 2009

Episode 197 of 459 episodes

You know how a police siren changes sound when it passes by you? That's the doppler effect. It works for sound waves and it works for light waves. Astronomers use the doppler effect to study the motion of objects across the Universe, from nearby extrasolar planets to the expansion of distant galaxies.