NASA's Spitzer and Deep Impact Build Recipe for Comet Soup

I am reading this article, NASA'sSpitzer and Deep Impact Build Recipe for Comet Soup, on NASA's website.
According to this article, when Deep Impact's probe collided with the comet Tempel 1 on 4 July 2005 Spitzer observed the cloud of ejected material with it infrared spectrograph.
The data from NASA Spitzer Space Telescope is being studied to determine with materials make up not just comets but planets and other bodies in our solar system.