The green flash is a rare, brief optical event of green, yellow, and sometimes blue that colors the horizon, occurring at ...

The green flash is a rare optical phenomenon above the horizon directly at sunrise or sunset. The color is caused by green ...

According to NASA, the green flash is a real phenomenon when the Sun sets or rises, and its light is refracted by the Earth's atmosphere. San Francisco Chronicle via Getty Images KEY WEST ...

As the sun dips below the horizon and the light starts to dim, lucky observers may spot a rare, brief flash of emerald. This is the "green flash," which can sometimes be seen right after sunset or ...

A creepy green flash illuminated the sky as the sun set over the ocean in Oregon. The bizarre moment was captured by Craig Hayslip, a faculty research assistant at Oregon State University.

There are very special cases, when the sky is very clear and exceptionally transparent, that a green flash can be glimpsed just as the very topmost part of the sun is rising or setting. Here is ...

Have you heard of “the green flash”? This elusive optical effect that happens during a sunset is the subject of debate online — with some people claiming it doesn’t even exist. And if you have never ...