Spectral arc over Paranal

Sky phenomena are not reserved for the night alone over the ESO Paranal site in Chile. Here a relatively rare instance of circumhorizontal arc, caused by particular scattering of light, casts vivd colours in the clouds. Excited photographers at the Paranal Visitor Centre point their cameras skywards. Paranal accepts visitors for free to explore its remote Chilean site, click here for more information on Paranal visits!