This artist's conception shows a young, hypothetical planet around a cool star. A soupy mix of potentially life-forming chemicals can be seen pooling around the base of the jagged rocks. Observations from the Spitzer Space Telescope hint that planets around cool stars, the so-called M-dwarfs and brown dwarfs that are widespread throughout our galaxy, might possess a different mix of life-forming, or prebiotic, chemicals than our young Earth. Life on our planet is thought to have arisen out of a