What makes the sky to turn green?

Question

I seen a flash of green light in the sky.

I seen a flash of green light in the sky at night.

Answer 1

Maybe green UFO's Or green Aliens.

Answer 2

If you look at the horizon at sunset--exactly as the last sliver of sun disappears--you might see a flash of brilliant green blaze across the sky. Indeed, an old Scottish proverb maintains that whoever sees this flash will always be lucky in love. While we can't confirm the lucky-in-love part of this, there is a scientific explanation for the flash of green light.
As sunlight enters our atmosphere, it bends slightly. This is due to refraction, the same thing that makes a pencil look slightly askew when you stick it half way into a glass of water. The atmospheric bending of light rays is greatest when the sun is right along the horizon, at sunrise or sunset.

How does bending sunlight create a green flash? When sunlight is bent by refraction, it separates into different colors, just like light through a prism. While a prism can make a dramatic rainbow, atmospheric refraction isn't that strong. It doesn't turn the sun into a rainbow, but it makes the lowest part of the sun seem a bit more red, and the top of the sun seem greenish blue. The effect is so subtle, you'd never notice it.

Except, of course, at sunset or sunrise. For a split second, when most of the sun's globe is below the horizon, the only part showing is that blue-green sliver along the top. Blue light is scattered by the atmosphere, so what's left is a brief flash of green, the only illumination in the sky! Please remember, this happens immediately AFTER a sunset. Never look directly at the setting sun.

Answer 3

Ok now for a real answer
The reason for a green flash lies in refraction of light (as in a prism) in the atmosphere: light moves more slowly in the lower, denser air than in the thinner air above, so sunlight rays follow paths that curve slightly, in the same direction as the curvature of the Earth. Higher frequency light (green/blue) curves more than lower frequency light (red/orange), so green/blue rays from the upper limb of the setting sun remain visible after the red rays are obstructed by the curvature of the earth. Green flashes are enhanced by atmospheric inversions, which increase the density gradient in the atmosphere, and therefore increase refraction. A green flash is more likely to be seen in clear air, when more of the light from the setting sun reaches the observer without being scattered. We might expect to see a blue flash, but the blue is preferentially scattered out of our line of sight and remaining light ends up looking green.

With slight magnification a green rim on the top limb of the solar disk can be seen on most clear-day sunsets. However the flash or ray effects require a stronger layering of the atmosphere and a mirage which serves to magnify the green for a fraction of a second to a couple of seconds.

Answer 4

The Green Flash is a well known phenomena to ocean navigators... you are lucky to see it because not many people have even seen it once.

Answer 5

IT WAS PROBABLY A METEORITE WHICH CONTAINED SOME COPPER WHICH WILL BURN GREEN. A SEVERE THUNDERSTORM CONTAINING HAIL WILL ALSO TURN THE SKY GREEN. SOMETHING TO DO WITH THE HAIL REFRACTING THE SUNS LIGHT.

Answer 6

Probably LSD