Is there a black hole at the center of every galaxy?

Question

It seems plausible to me simply because most of the galaxies I've seen are spiral shaped. They must be orbiting SOMETHING with a great gravitational force. But it's just a theory on my end. Is there any scientific data to back this up?

Answer 1

Quite possibly.

Answer 2

Yes, they are the gravitational "seed" around which galaxies form.  These are not your "ordinary" 3+ solar mass black holes, they have the mass of millions of suns.

Answer 3

When stars die they either turn into a black hole or a red dwarf. This isdepending on their size and stuff. There are three types of galaxies: spiral, eliptical and irregular. Spiral contains mostly new stars, while eliptical has alot of old and dead stars, as in black holes.

Google star life.

Answer 4

Larger galaxies as a rule of thumb have a black hole at the center which represents about 1.5% of the mass of the galaxy.  However, not all galaxies necessarily have these black holes right at the center.  Technically, the Magellanic clouds are considered to be separate galaxies, but they are small, not spiral, and so they probably don't have black holes at their centers.  Also, I have no idea if that rule applies to irregular or elliptical galaxies.