Lost in Nebula - Advexon TV This is a meditation, relaxing video for calmness. A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. Meditation Video Thanks for watching Make sure to subscribe and leave a comment below.