This is neat.

Hubble discovers carbon dioxide in the atmosphere of a planet orbiting another star, an important step along the trail of finding the chemical biotracers of extraterrestrial life as we know it. The Jupiter-sized planet, called HD 189733b, is too hot for life. But the Hubble observations are a proof-of-concept demonstration that the basic chemistry for life can be measured on planets orbiting other stars. Organic compounds can also be a by-product of life processes, and their detection on an Earth-like planet may someday provide the first evidence of life beyond Earth.
Credits: NASA, ESA, and M. Swain (Jet Propulsion Lab/Caltech)