SOHO Watches a Comet Fading Away (IMAGE) NASA/Goddard Space Flight Center Caption On September 30, 2010, water production on Comet Hartley 2 -- as represented by the hydrogen cloud surrounding the comet seen by SOHO -- jumped by a factor of two and half in a single day. (Comet and cloud size are not to scale.) Inset upper right: Comet Hartley 2 as viewed by EPOXI from 435 miles away on November 4, 2010. Credit Credit: NASA/Steele Hill Inset Credit: NASA/JPL-Caltech/UMD 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.