Schematic Representation of the Orbits of 6 of the 7 Extreme Trans Neptunian Objects (image) Instituto de Astrofísica de Canarias (IAC) Share Print E-Mail Caption Schematic representation of the orbits of six of the seven extreme trans Neptunian objects (ETNOs) used to propose the hypothesis of the "Planet Nine". The dashed red curve shows the orbit of this possible planet. Credit Wikipedia. Usage Restrictions Documents and materials on the IAC website are copyright of the Instituto de Astrofísica de Canarias. Use for commercial and publicity purposes is not authorised. Text and images may only be reproduced with the prior express permission of the Science Communication and Education Unit of the Instituto de Astrofísica de Canarias. To request permission: Include the address of the image (or information about it) in a request addressed to the Head of the Communication and Scientific Culture Unit (secUC3@iac.es) explaining what the image will be used for. Share Print E-Mail 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.