Corvin
The satelite senses infrared light coming from 420 light yrs away. That means that that light has been traveling through space for 420 yrs.
identify what kind of organic chemical
I believe that the mechanism is something like the following: each element has its own spectrum of light that it reflects. You can see those colors if you break it up the light w a prism. I would think that working w infrared light would be similar to working w white light. Perhaps someone who knows more could fill it in, or research it.
The infrared-sensing eyes of NASA's Spitzer Space Telescope made the latest discovery.
Infrared light penetrates dust, allowing astronomers to see into dusty areas. Spitzer - launched last August - can image these areas with unprecedented clarity and detail.
Organic compounds are simply those that contain carbon. Inorganic is all of the others. Life is carbon based. That's why scientists are intersted in this.
SS