 case history case history laurie 16 july 2017 1142am an example of the application of yaffs in a demanding environment nasa tess mission this transiting exoplanet survey satellite tess  will discover thousands of exoplanets in orbit around the brightest stars in the sky it is a project regularly using our yaffs file system to store incoming data and preserve it in the rigours of the space environment before sending it back to earth in a twoyear survey of the solar neighborhood tess will monitor more than 200000 stars for temporary drops in brightness caused by planetary transits this firstever spaceborne allsky transit survey will identify planets ranging from earthsized to gas giants around a wide range of stellar types and orbital distances no groundbased survey can achieve this feat some file systems are not robust enough to be suitable for such exacting work  