Investigating the Habitability of Exoplanets | NASA's Chandra X-ray Observatory FriendsofNASA.org: Using NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton, astronomers are testing how habitable exoplanets are based on whether they receive lethal radiation from the stars they orbit. This type of research will help guide observations with the next generation of telescopes aiming to make the first images of planets like Earth. A team of researchers examined stars that are close enough to Earth