Experiment (IMAGE) University of Texas at Austin Caption This is a video of a melt-resistant sphere falling through a magma sample. The researchers calculated the viscosity of the magma sample by measuring how quickly the sphere sunk through the magma. Credit Nick Dygert Usage Restrictions Credit image 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.