Phobos Ring (image) Purdue University Share Print E-Mail Caption A new theory by Purdue University scientists says that the Martian moon Phobos might eventually break apart, forming a ring around the red planet. The NASA-funded scientists theorize that this ring formation has happened before, and that as the moons break apart some of the material falls to the surface, as shown in this illustration. Credit Illustration by Purdue University Envision Center Usage Restrictions None 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.