Whirlpool Galaxy and Dwarf Companion (IMAGE) Rochester Institute of Technology Caption This image, captured by the Very Large Array, shows the atomic hydrogen distribution of the Whirlpool Galaxy. The "X" marks the dwarf companion satellite. Dynamical simulations can recover its location and mass. Credit VLA, Chakrabarti et al. 2011 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.