Gal­ax­ies con­tain three types of black holes

The uni­verse is full of black holes, which ex­ist in spe­cific places of the gal­ax­ies, de­pend­ing on their sizes. The small­est holes are the most com­mon, whereas the big­gest ones only ex­ist at the cen­tres of ma­jor gal­ax­ies.

Science Illustrated - - BLACK HOLES -

Holes the size of stars

The small­est black holes emerge, when ma­jor stars ex­plode into su­per­novas. The holes ex­ist any­where in all types of gal­ax­ies, and they typ­i­cally weigh 5-30 so­lar masses.

Medium-sized black holes

Black holes of a thou­sand to two mil­lion so­lar masses are rare. They only ex­ist at the cen­tres of some small dwarf gal­ax­ies, but not in the least in all of them.

Su­per­mas­sive black holes

Black holes can grow to 2 mil­lion-40 bil­lion so­lar masses, such as af­ter two gal­ax­ies col­lide. The holes ex­ist at the cen­tres of all ma­jor spi­ral and el­lip­ti­cal gal­ax­ies.

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