High-energy radiation (IMAGE) Helmholtz-Zentrum Dresden-Rossendorf Caption The images show how the density of the plasma (shown here in black and white) evolves over time during irradiation with two counter-propagating high-intensity laser pulses. The high-energy radiation produced during this process is highlighted in color as gamma photon density. These photons are so close together from the time the two lasers clashed that they can collide to create matter-antimatter pairs. Credit Toma Toncian Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.