Diocese definition, an ecclesiastical district under the jurisdiction of a bishop. See more.
planetary nebulae represented here by the ring nebula are examples of emission nebulae an emission nebula is a nebula formed of ionized gases that emit light of various colors the most common source of ionization is high energy photons emitted from a nearby hot star
Cancel. A nebula is an interstellar cloud that is comprised of dust and light elements such as hydrogen and helium. Find out about ho gravity and pressure keep nebulas from collapsing with help from an applied physics professional in this free video clip.Part of the Video Series: Such Great Physics.ideo Transcript. Hello, my name is Walter Unglaub, and this is how do gravity and pressure keep nebulas from collapsing. A nebula is an interstellar cloud that is comprised of dust and light elements such as hydrogen and helium.