Sometimes, under direct sunlight, clouds will appear gray or dark gray against a blue sky or larger backdrop of white clouds. There are usually two reasons for this effect. This latter reason is ...
On Rum, Europe’s newest dark-sky sanctuary, the island’s 40 residents ... with the support of Steven Gray and James Green, two astronomers who started Cosmos Planetarium, a mobile theater ...
Symphony Under the Stars is one of many events at the annual Dark Sky Festival (17 October to 2 November 2025) held in Jasper National Park, one of the world's largest and most accessible dark sky ...
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