ocr: BIRTH OF ASTAR Interstellar matter is distributed irregularly in space, being concentrated here and there. For a number of reasons, for example, due to a blast wave from a nearby supernovo explosion, such a concentration might start to compress. Due to gravity, the compression The American COBE satellite discov- would continue, finally resulting in a proto- ered that the background radiation is star, which is mainly composed of hydrogen not complefely even as seen in these molecules. pictures. As the compression continues, the tempera- ture increases, causing the hydrogen molecules to disinteg ...
