Why is the sky blue on Earth, yet space appears pitch black? This video uncovers the science behind one of nature’s most ...

Time-lapse video taken from Croatia at around 4 p.m. EST, or 9 p.m. local time, shows the glowing light spinning across the sky in what many social media commentators likened to a spiral galaxy.

When millions of people turn off their lights for Earth Hour each year, something remarkable happens in the night sky above ...