Evaporating gaseous globule
An evaporating gas globule (EGG) is a region of hydrogen gas in outer space approximately 100 astronomical units in size, such that gases shaded by it are shielded from ionizing UV rays. Dense areas of gas shielded by an evaporating gas globule can be conducive to the birth of stars.
Source: Wikipedia — Evaporating gaseous globule (CC BY-SA 4.0)