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Astronomy & Astrophysics
Michael Reid

Lecture 9 2/26/2013 2:16:00 PM Star Formation:  How can we figure out where new stars form?:  Since blue stars don't live very long (red live very long), you would expect to see more blue stars where a new stars are being made  galaxies that have more blue light have more young stars  red nebulae is hydrogen gas (hydrogen emits red wavelengths of light)  lots of blue stars -> lots of young stars  lots of dust among the stars  visible light shows hot gas and stars  the infrared light shows all the cold dust  dust lines up with new stars  dust absorbs visible light, heats up, and re-emits that light in the infrared Orion Nebula: a nearby star-forming region  In such nebulae, we tend to find lots of dark patches -> gas and dust concentrated enough to block out background light
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