Star-forming region near the center of the Milky Way. Composite image, assembled from infrared images taken by the Hubble Space Telescope, the Spitzer Space Telescope, and the Chandra X-Ray Observatory in 2009. NASA & ESA The most complex organic molecule yet to be discovered in interstellar space has been reported. While organic molecules that are organized in a straight line have been seen previously, the new molecule—iso-propyl cyanide—is the first molecule found with a branched structure. In the 1980s, scientists were beginning to realize that it’s possible for complex organic molecules to form on the surfaces of dust grains. As a result, some of them predicted that the interstellar medium would contain complex, branched molecules.