One of the most famous and beautiful cosmic sights shows its colors in this new image from the Hubble Space Telescope. The Veil Nebula is the remnant of a massive star which exploded in a supernova 10 ...

Each group is color-coded. The yellow group is the easiest to figure out, followed by the green, blue, and purple groups. Pick four words and hit Submit. If you’re correct, the four words will ...