This abstract night-sky photo shows the full moon peeking through wispy clouds and barren tree branches while surrounded by brilliant, blue lunar corona. A relatively rare sight, this optical ...

BONDI 1 has pointed out that with certain very general assumptions, notably the cosmological principle, it can be inferred from the observed darkness of the night sky that the universe is either ...

To ponder the twinkling sky is a pleasure ... as the man-made alteration of night lighting levels – is a glaring one. But it’s a type of pollution more abstract than, say, a sputtering ...