Astron.
a cluster of about 500 galaxies in the direction of the constellation Perseus, grouped around a particular Seyfert galaxy that is an intense radio source (Perseus A) .
Astron.
a cluster of about 500 galaxies in the direction of the constellation Perseus, grouped around a particular Seyfert galaxy that is an intense radio source (Perseus A) .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012