Gemini North telescope (IMAGE) University of Utah Caption The astronomers measured the movement of the stars using the Gemini North telescope located on Mauna Kea volcano in Hawaii. They applied a technique known as adaptive optics to the ultra-compact dwarf galaxies to correct for distortions caused by the Earth's atmosphere. Credit Gemini Observatory/AURA Usage Restrictions Reuse with attribution 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.