Jupiter and Mars have joined a famous asterism called the Winter Hexagon ... we’d never have night when Rigel was in the sky. Rigel is huge and unstable, and it will become a supernova someday.

They found that “The Starry Night” was turbulent, and not just by artistic standards. A decade later, astrophysicist James Beattie analyzed the variations in luminance in a patch in the middle ...