Dark matter, which makes up 80 percent of all matter in the universe, may have formed in the very short time before the big ...

When visible light particles reach Earth's atmosphere ... the pink hue that is superimposed with the dark blue sky produces a ...

Auroras can appear green, pink, dark red, blue, purple and even yellow ... caused by the interaction between solar particles and our planet's atmosphere. Auroras come in a wide variety of colors ...