[/caption] Astronomers usually curse and shake their fist at clouds for obscuring the sky and spoiling their observations. This month however, we enter the season when, after dark, thin veils of clouds appear to glow with an eerie blue light and are eagerly awaited and sought after. Polar mesospheric, noctilucent or night shining clouds (NLC) … Continue reading "It’s Time to Welcome Night Shining Clouds"