A Different Sibling (IMAGE) Instituto de Astrofísica de Canarias (IAC) Caption In this study the 55Cnc planetary system has been analyzed: the Earth sibling in this system presents a very different chemical structure. Credit NASA 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.