What Is Light Time?
Credit: University of Arizona
Downloads:
full (1910x2129) | thumbnail (150x150) | medium (269x300) | medium_large (640x713) | large (640x713) | banner-xm (427x240) | banner-sm (640x360) | banner-med (854x480) | banner-large (1024x576) | banner-full (1280x720)