Echo-1 Balloon Satellite Echo1 sits fully inflated at a Navy hangar in Weeksville, North Carolina. The spacecraft measured 100 feet across when deployed
English Echo and Narcissus (1903). Oil on canvas, 109.2 x 189.2 cm (43.0 x 74.5 in). Walker Art Gallery, Liverpool Spanish Eco y Narciso (William Waterhouse)
sample of nearby SNe which best matches the observed light echo spectrum. determination method: SHA-1 described at URL: https://noirlab.edu/public/images/geminiann08010b