Stunning sunset! This happens because of a phenomenon called Rayleigh scattering: cirrus clouds scatter the longer, red wavelengths of light and give the sky an orange or reddish hue | source
The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot.