Changes

#[[Nebula]]- A huge cloud of [[gas]] and dust stretching across space which collapses due to [[gravity]] to form [[star]]s.#[[Protostar]]- A glowing ball of [[gas]] and dust that is not yet hot enough for [[Nuclear Fusion|fusion]] to occur in its core.#[[Main Sequence Star]]- The longest and most stable period of a [[star]]s life when the outward pressure caused by [[Nuclear Fusion|fusion]] of [[Hydrogen]] in its core is balanced by the inward [[pressure]] caused by [[gravity]].#[[Red Super Giant]]- A [[massive]] [[star]] that has run out of [[Hydrogen]] for [[Nuclear Fusion|fusion]] so the [[pressure]]s are no longer balanced and its core collapses under [[gravity]] until the core is hot enough to [[Nuclear Fusion|fuse]] [[Helium]] into more [[massive]] [[element]]s. During this time the outer layers expand as the [[star]] cools but becomes brighter as it becomes the largest type of [[star]] in the [[universe]].#[[Supernova]]- When a [[massive]] [[star]] runs out of [[Helium]] to [[Nuclear Fusion|fuse]] the core collapses rapidly. Eventually the [[element]]s collide with one another and rebound outwards into an explosion known as a [[Supernova]] which can be brighter than all the other [[star]]s in a [[galaxy]] put together.

#*[[Neutron Star]]- The [[element]]s in the core become packed so tightly that all the [[proton]]s become [[neutron]]s and the [[star]] becomes one giant [[atom]] around 20km across made of only [[neutron]]s.#*[[Black Hole]]- The most [[massive]] [[star]]s collapse into a point so small that the [[gravity]] becomes so intense that not even [[light]] can escape. This is a [[Black Hole]].