Does every spiral galaxy in the universe has BLACK HOLE at its centre?

Question

Recently I have seen a BBC program on Black Holes. I assumed after watching that show, that the galaxies which have Black Holes at its centre are actually sprial. This is because Black Hole is consuming the galaxy which makes it look spiral when seen from outside the galaxy.

Answer 1

All spiral galaxies have a massive black hole at their centers. This is how galaxies start. It first starts with a black hole at the center of a gas cloud, which consumes the inner most material and causes gravitational waves through the gas cloud, which sparks off star formation, and eventually over time becomes a spiral galaxy. The black hole at the center of most galaxies are done consuming material because there is no more material near the black hole to be sucked in. What is left is a black hole with no material close enough to the black hole to be sucked in and the rest of the galaxy orbits around the black hole.

Answer 2

Well, I've read recent conjecture that that may be the case... It's not all that hard to imagine, really.

While the black hole is consuming everything that gets too close, I don't think it makes a galaxy "appear" as spiral - I believe that shape is a natural occurance in nature, and with the mass of a galaxy to deal with, it wouldn't matter if a black hole was at the center or not... however, I wouldn't doubt that at the center of *all* galaxies is a super-massive black hole.

Answer 3

It seems likely that most spiral galaxies have central supermassive black holes. However, their spiral shape is not due to the black hole 'consuming the galaxy'. On the contrary, it is merely due to the way gravity works throughout each galaxy, and the associated orbits of the stars and gas clouds that make up the galaxies. Central black holes don't actually consume matter all that fast.

Answer 4

If a black hole could exist one would likely reside at the center of all galaxies.
The black hole would continually consume the star population until all matter in the galaxy had been converted to the mass of the black hole.
There is some where for all celestial bodies to evolve to,but when the stage of a black hole was reached it could go no further.
A black hole is the result of a mathematical equation,but there are some very good reasons why a black hole is a non viable entity.

Answer 5

Most galaxies probably have a black hole at the center.

The black hole has very little to do with the spiral structure of the galaxy itself, which is due to density waves in the disk. It simply is not massive enough to cause major changes in the structure of the galaxy.

The black hole is not consuming the galaxy. It is typically 0.2% of the mass of the galaxy. Black holes don't have any more gravity than anything else, unless you get super-close to them. They are not interstellar vacuum cleaners eating entire galaxies.

Answer 6

Probably all galaxies do have black holes at their core. Our galaxy does for sure.
Do not make the common mistake of thinking that the solar system is the same thing as the galaxy. It is not. Our Sun (with all its planets, including Earth) is just one of billions of stars in the Milky Way galaxy.

Answer 7

When you see this really, really rotund person waddling down the street, do you conclude it's probably because he had this huge meal last night or do you deduce that he's been horking food down his gullet for most of his life? At the galactic core, stars and clouds and all that stuff are closer together than in the outer parts where we live. A decade is less than an eyeblink in galactic terms. But if it happens every few thousand years, that BH really ought to go on a diet.

Answer 8

Counterexample: A spiral galaxy with a sun at the center, they don't have a Black Hole always, just most of the time

Answer 9

yes I will go and find a couple links to show you and you can read about them, pretty facinating those big monsters are,,

hundreds of Black holes discovered,, from universe today,

http://www.universetoday.com/2007/10/29/hundreds-of-hidden-black-holes-discovered/


AN EVEN MORE MASSIVE BLACK HOLE DISCOVERED 1.8 BILLION LIGHT YEARS AWAY FROM EARTH,, THIS ONE IS A MONSTER.

http://www.universetoday.com/2007/10/30/an-even-more-massive-black-hole/]

GIANT SPACE CLOUD MAY BE PWERED BY BLACK HOLES

http://www.netscape.com/viewstory/2007/04/23/giant-space-cloud-may-be-powered...


BLACK HOLES WARPING TIME AND SPACE,, A SHORT MOVIE THAT PUTS IT INTO PERSPECTIVE,,

http://www.space.com/interplayer/blackholes/