Despite decades of searching for this signal, astronomers have yet to find it. The problem is that our Earth is too noisy, ...

it usually remains dark because none of the ice crystals reflect light at smaller angles than 22 degrees. The ring will remain visible as long as cirrus clouds create a veil across the moon.

But think of dark clouds behind which the sun is hidden ... Here are some other informal expressions involving clouds or sky. Over the moon / On cloud nine: if you are over the moon or on cloud ...

SINGAPORE: The glowing Harvest Moon on Sept 18 delighted skygazers in Singapore, even as visibility of the supermoon was at times obscured by clouds. An astronomy enthusiast who wanted to be known ...