... Cool stars have different mix of life-forming chemicals . ... A new study from NASA's Spitzer Space Telescope hints that planets around stars cooler than our Sun might possess a different mix of potentially life-forming, or т??prebiotic,т?? chemicals. ... Astronomers used Spitzer to look for a prebiotic chemical, called hydrogen cyanide, in the planet-forming material swirling around different types of stars. ... If the answer is no, then questions about life around cool stars become moot." ...