Quasar

[Tornado 7]

I quasar sono rari o comuni da trovare? nel senso, le galassie coi flussi che escono dal nucleo sono comuni oppure sono poche ?

[Tizzio]

As quasars are rare objects, the probability of three or more separate quasars being found near the same location is very low. The first true triple quasar was found in 2007 by observations at the W. M. Keck Observatory Mauna Kea, Hawaii.[26] LBQS 1429-008 (or QQQ J1432−0106) was first observed in 1989 and was found to be a double quasar; itself a rare occurrence.

fonte: wikipedia

[Tornado 7]

thanks! e io che cercavo sui forum di astronomia..