A 90 degree panorama of the massive grand display of noctilucent clouds at dusk in southern Alberta, Canada. - Fotografía de stock

June 16, 2021 - A 90 degree panorama of the massive grand display of noctilucent clouds at dusk in southern Alberta, Canada. This shows the arc of the NLCs, defined at the top by the edge where sunlight is no longer illuminating the clouds, an edge that drops in altitude as the Sun itself drops farther below the horizon. Capella is at centre, Leo and Regulus at far left, and Perseus at right of centre. The main colour of NLCs is electric blue, very much so this night when they were so bright.