There are very special cases, when the sky ... sunrise and sunset. But there are very special cases, when the sky is very clear and exceptionally transparent, that a very tiny segment of the green ...

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 ...

Although the moon's light will flood the sky in the Northern Hemisphere ... may see the greenish haze surrounding it. This green glow is thought to be created by atoms of diatomic carbon ...

There, it created a green apocalyptic-looking sky that went viral on social media ... Sunlight during sunrise/sunset is passing through more of the atmosphere so red and yellow pass through.

Context: It glows green thanks to sunlight reacting with carbon molecules in its coma, a common feature of comets making their way toward the sun, per Sky & Telescope. What's next: It's getting ...