Oxygen produces green and red light while nitrogen gives off blue and purple. The best time of year to view the light show is during the winter months when the nights are longer.
The brightness of the moon's red glow depends upon how much dust and clouds are in the Earth's atmosphere, following volcanic activity Ash can block out enough light to render the moon a darker red or even mere black.
I do not expect something actually smart to attack us with marching robot armies with glowing red eyes where there could be a fun movie about us fighting them.
I saw the skins of tigers flaming in his palace on the Grand Canal; I saw him opening a chest of rubies to ease, with their crimson-lighted depths, the gnawings of his broken heart.
Only a little light, red in color, made its way through the glass, and served to lighten the nearer and larger objects. My eyes, however, tried and failed to see into the far, high corners of the room.
He raised the wand above his head, brought it swishing down through the dusty air and a stream of red and gold sparks shot from the end like a firework, throwing dancing spots of light on to the walls.
There was a dazzling flash of scarlet light and Lockhart was blasted off his feet: He flew backward off the stage, smashed into the wall, and slid down it to sprawl on the floor.