Sa réalteolaíocht, croíleacán cóiméid, timpeall 1-10 ciliméadar ar leithead, comhdhéanta as oighear agus deannach. Nó an chuid lárnach de réaltra nó cuasár, go minic ionad gníomhaíochta ardfhuinniúla sa réaltra.[1]
Tagairtí
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