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: [[Nebula]]e can stretch many [[Light Year|light years]] across and have enough [[mass]] to form many [[star]]s and [[Solar System|solar systems]].
: Small regions of a [[nebula]] can begin to collapse under [[gravity]] to form a [[star]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Nebula, pages 275, 280, 284-5, 287-8, GCSE Physics; Student Book, Collins, AQA '']