The sky appears blue because short wavelengths of light are scattered more strongly by the atmosphere than long wavelengths. Select all the observations that are also a result of this scattering. Multiple select question. Fluorescent objects, which respond to ultraviolet light, appear to glow the most strongly at twilight. It is still light out for a while after the Sun is below the horizon. The sky is reflected as a mirage on a hot day. The Sun is reddest at sunset