View source for Red Super Giant

==Key Stage 4==
===Meaning===
A '''red super giant''' is the stage in a [[High Mass Star|high mass star's]] life when it has run out of [[Hydrogen]] to [[Nuclear Fusion|fuse]] and begins to [[Nuclear Fusion|fuse]] [[Helium]].

===About Red Super Giants===
: : When a [[massive]] [[Main Sequence Star|main sequence star]] runs out of [[Hydrogen]] the core collapses because there is an inward [[pressure]] of [[gravity]] but no outward [[pressure]] from [[Nuclear Fusion|fusion]]. Eventually the core collapses to [[heat]] the core enough that [[Nuclear Fusion|fusion]] of [[Helium]] can occur.
: As the core of the '''red giant''' collapses the outer layers begin to spread further from the core making the [[star]] grow in [[Volume (Space)|volume]] and the '''red super giant''' becomes the largest type of [[star]] in the [[universe]].
: A '''red super giant''' is much cooler than other [[star]]s but also much brighter due to its larger [[Surface Area|surface area]].