The Bubble Nebula, aka NGC 7635, is an emission nebula located in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, young central star. The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. Awesome stuff here folks! ................................................................................................................................................... #science #space #bubble #nebula #nature