At Milky Way’s Center, Scientists Find Big Bubbles of Energy. Instruments such as the gamma-ray telescope that see into more energetic parts of the electromagnetic spectrum are opening up new vistas of the universe that are very difficult to explain with standard gravitational theories. Most puzzling to scientists in this latest discovery are the sharp boundaries that define two gigantic bubbles of energy erupting from the centre of the Milky Way galaxy. From an electrical point of view, sharp boundaries known as double layers naturally form between regions of different densities, temperatures or magnetic field strengths in space. A double layer consists of two layers of opposite charge and tends to form cellular structures with the double layer as the "cell wall."