NASA Spitzer Finds Water Vapor on Hot, Alien Planet Artist Concept

This artist impression shows a gas-giant exoplanet transiting across the face of its star. Infrared analysis by NASA Spitzer Space Telescope of this type of system provided the breakthrough.

This artist impression shows a gas-giant exoplanet transiting across the face of its star. Infrared analysis by NASA Spitzer Space Telescope of this type of system provided the breakthrough.

HD 189733bSpitzer Space Telescope