["http://images-assets.nasa.gov/image/PIA21049/PIA21049~orig.jpg", "http://images-assets.nasa.gov/image/PIA21049/PIA21049~small.jpg", "http://images-assets.nasa.gov/image/PIA21049/PIA21049~thumb.jpg", "http://images-assets.nasa.gov/image/PIA21049/metadata.json"]