Fig. 1 (IMAGE) Lomonosov Moscow State University Caption The formation of filaments upon the collision of a shock wave with two molecular clouds. Credit Valery Goryachev and Boris Rybakin 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.