Nebula

A nebula is a clump of gas either created by the death of stars or just a concentration of normal gas formed from the big bang. In those nebulas, if there are enough mass and the gas is dense enough, stars can form.

All stars form from nebulas. If nebulas didn't exist, the sun (and since theres no gas also earth) wouldn't exist.

Nebulas are colorful, but there alre also dark nebulas which appear completely dark.