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Created page with "==Key Stage 4== File:RedGiant.png|right|300px|thumb|'''Red giants''' are too far away to get a clear image of their surface, so this is an artist's impression of a '''red gi..."
==Key Stage 4==
[[File:RedGiant.png|right|300px|thumb|'''Red giants''' are too far away to get a clear image of their surface, so this is an artist's impression of a '''red giant'''.]]
===Meaning===
A '''red giant''' is a [[star]] in which the [[Hydrogen]] [[isotope]]s have run out and [[energy]] is released from the [[Nuclear Fusion|fusion]] of [[Helium]].
===About Red Giants===
: When a [[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]].
: A '''red giant''' is much cooler than other [[star]]s but also much brighter due to its larger [[Surface Area|surface area]].
[[File:RedGiant.png|right|300px|thumb|'''Red giants''' are too far away to get a clear image of their surface, so this is an artist's impression of a '''red giant'''.]]
===Meaning===
A '''red giant''' is a [[star]] in which the [[Hydrogen]] [[isotope]]s have run out and [[energy]] is released from the [[Nuclear Fusion|fusion]] of [[Helium]].
===About Red Giants===
: When a [[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]].
: A '''red giant''' is much cooler than other [[star]]s but also much brighter due to its larger [[Surface Area|surface area]].