While photographing the auroras during a geomagnetic storm, Mike Lewinski caught sight of something extraordinary: a ...

What was the mysterious beam of light seen from Arizona and other western states on May 16? Was it STEVE? An astronomer offers insight on the cause.

A relativistic electron beam travelling on an undulating path interacts with a laser and emits light carrying orbital angular momentum. The wavelengths of these bright twisted-light beams can go ...