As reliably as an evening with an epic sunset, social media platforms flooded with similar, colorfully striped images Tuesday night when the sky turned dark in San Francisco. The event wasn’t ...

A massive green and blue laser beam was spotted in the San Francisco sky earlier this week, and despite plenty of speculation online, no one seemed to know much about its purpose or origin – until now ...

In a discovery that challenges conventional optics, scientists have managed to make a laser beam cast its own shadow—a feat previously thought impossible, as light typically passes through other light ...