Astronomy Cast Ep. 255: Observing Hydrogen
Channel: astrospherevids
Date: 06/03/2012

Hydrogen is the most common element in the Universe, formed at the beginning of everything in the Big Bang. It's the raw material of stars, gathering together through mutual gravity  into vast nebulae. Astronomers can learn so much looking for hydrogen in the Universe. Here's why, and how they do it.