We have been engaged in a ground based U-band survey of a sample of very large scale length (> 5 kpc), relatively isolated, face-on disk galaxies that exhibit strong spiral structure, in order to identify potential candidates like the remarkable galaxy NGC 300, which has recently been shown to exhibit a continuous exponential disk over 6-10 optical scale lengths. Our U-band data shows coherent exponential disks over 4-5 scale lengths and we seek to use the excellent power of GALEX in detecting low surface brightness stellar populations to better show the true extent of these disks, The detection of such extended stellar distributions would provide strong confirmation that a) star formation does occur in very low surface density environments, b) disk galaxies have dynamical continuity that exceeds that which can currently be understood theoretically and c) such extended environments are the parent population of intergalactic stars/baryonic debris as these environments are disrupted through hierarchical clustering processes. If the NGC 300 phenomena can be shown to exist in other structures then this represents a profound theoretical challenge to both our understanding of disk galaxy formation and assembling as well as star formation. Two added bonuses of these observations are 1) the discovery of another laboratory to potentially study the dynamics of objects located in a very low gravitational acceleration environment and 2) obtaining NUV morphologies of very large disk galaxies, (which are likely the objects most easily detected at high redshift) at the same rest frame stellar population light as high redshift disks. Convolving the images to the same physical resolution would then allow for a direct comparison of galaxy morphology in large disk galaxies at z=1 compared to z=0..