No, and I blame the fools in the media for making people think otherwise. Black holes are points in space where gravity reaches infinite levels. And, like a bubble, but for different levels, everything is spherical. Bubbles do it because the surface area is least. Blakc holes do it because the volume is filled most efficiently that way.
Furthermore, if it were, say a cube in shape, the corners of the structure would be pulled in, as there's less to support them than in a sphere.
No, a black hole although a black hole pulls things in a circular fashion, those objects are basically just falling, just the way something on earth would fall to the ground.
Tornadoes and whirlpools pull objects in by the movement of air and water respectively. Essentially, something sucked into a tornado is blown away by the wind because, simply put, a tornado is spinning wind.
Also, things that fall into a black hole can never come back out while objects pulled into a tornado or whirlpool are just carried to another place.
no, it is a sphere
a black hole is formed when a star dies (it explodes). sometimes it can also form a nebulae
There can never be a galaxy without a black hole. The anti-matter is necessary to cause the matter to spiral. It creates a huge suction.
The mathematics of a black hole itself does not require them. However matter around them will tend to orbit the black hole before eventually falling in, this creates what is called an accretion disk which could be considered a "ring". There is also strong evidence that all spiral galaxies contain a super massive black hole, if this is indeed the case then the entire disk of such galaxies could be considered a second "ring".
Yes. All galaxy objects revolve around the centre of mass, which we believe is a massive black hole.
Sorry, the universe does not have one center. According to the usual interpretation of the Big Bang theory, any and all points in the universe can equally be considered centers of the universe.Perhaps you meant to ask "Why does Sagittarius A indicate that a black hole is at the center of the Milky Way Galaxy?" instead. Galaxies do have distinct centers, all spiral galaxies are now believed to have a supermassive black hole at their centers, and our galaxy: the Milky Way is a spiral galaxy. The observations of the object called Sagittarius A match what would be expected of a supermassive black hole and are in the right galactic direction to place it at the center of the Milky Way galaxy.
A black hole, that's why it's a spiral,
No. But most spiral and elliptical galaxies do.
Stars, nebula, and a super-massive black hole at it's center.
It is currently believed that all spiral galaxies have a supergiant black hole at their centers and all galaxiesand globular clusters have several ordinary black holes scattered throughout them.
a black hole is formed when a star dies (it explodes). sometimes it can also form a nebulae
Both have a huge black hole at their center.
A spiral galaxy, as its name implies, has one or more spiral arms that stretch out from the center. The center often contains a bulge of stars and sometimes can even contain an active black hole.
It is believed that there are black holes in the centers of many galaxies. I believe a super-massive black hole
yes, every thing has a middle point to make its shape
Any star that gets too close to a black hole can be drawn into it. But most stars can orbit the center of the galaxy almost indefinitely, without such a thing happening.
The center of many galaxies is suspected to house a "supermassive black hole". The black hole may even weigh more than all the stars in that galaxy combined. Spiral galaxies are more likely to contain a supermassive black hole.
There can never be a galaxy without a black hole. The anti-matter is necessary to cause the matter to spiral. It creates a huge suction.