Spiral Galaxy NGC 4921 (IMAGE) International Centre for Radio Astronomy Research Caption This artist's impression shows the spiral galaxy NGC 4921 based on observations made by the Hubble Space Telescope. Credit Credit: ICRAR, NASA, ESA, the Hubble Heritage Team (STScI/AURA) Usage Restrictions 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.