Stickney Crater on Phobos (IMAGE) DOE/Lawrence Livermore National Laboratory Caption Lawrence Livermore National Laboratory researchers have demonstrated for the first time how an asteroid or comet could have caused the mega crater on Phobos without completely destroying the Martian moon. Credit Viking Project, JPL, 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.