How does a new galaxy get formed?

Question

I tried looking it up myself, but my results were confusing, I didn't understand it. In *moderately* simplified terms, how does a new galaxy get formed?

Answer 1

In the simple terms:

A super-massive black hole (a remnant of one of the first-generation, super-massive stars that formed after the big bang from the denser areas of matter) has a disk of hot matter (from the big bang and possibly it's own super-nova) spinning around it on which it is feeding. This disk would be similar in shape, but infinitely much larger than the disk of rock and gas that was spinning around our own young Sun from which the planets of our solar system formed. Eventually, after many, many millions of years, clumps of the disk spinning around the black hole would coalesce into stars (with their own disks of rock and gas spinning around them). These stars would continue to orbit around the super-massive black hole, just like planets orbit around stars, and moons orbit around planets. The black hole would continue to feed on the stars closest to it until, eventually (after, maybe, hundreds of millions of years), the number of stars that are close enough to be pulled into the black hole diminishes until none are being pulled in. The rest of the stars are far enough away from the black hole and their speed is high enough that the angular momentum (or centrifugal force) of their orbits (which pulls them away from the black hole) equals the gravitational pull of the black hole. The super-massive black hole then stops "feeding" and goes dormant, and the galaxy becomes stable.

Since the gravitational pull of the black hole is stronger the closer a star is to the black hole, the angular momentum (and, therefore, the orbital speed) of the stars orbiting closer to the black hole is greater than the speed of the stars orbiting farther away from the black hole. (Just as Mercury orbits around the Sun faster than Venus, which orbits faster than the Earth, which orbits faster than Mars, and so on.) This is what gives spiral galaxies their beautiful spiral shape.
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Answer 2

The formation of galaxies is still one of the most active research areas in astrophysics; and, to some extent, this is also true for galaxy evolution. Some ideas, however, have gained wide acceptance.

Galaxy formation is presently believed to proceed directly from structure formation theories, formed as a result of tiny quantum fluctuations in the wake of the Big Bang. N-body simulations have also been able to predict the types of structures, morphologies, and distribution of galaxies which we observe today both in our present universe, and - by examining distant galaxies - in the early universe.

The earliest modern theory of the formation of our galaxy (known by astronomers as ELS, after the initials of the authors of that paper, Olin Eggen, Donald Lynden-Bell, and Allan Sandage describes a single (relatively) rapid monolithic collapse, with the halo forming first, followed by the disk. Another view published in 1978 (known as SZ for its authors, Leonard Searle and Robert Zinn describes a more gradual process, with smaller units collapsing first, then later merging to form the larger components. An even more recent idea is that significant portions of the stellar halo could be stellar debris from destroyed dwarf galaxies and globular clusters that once orbited the Milky Way. The halo would then be a "newer" component made of "recycled" old parts

Answer 3

I will tell you this, a Galaxy is formed during the time God created the heavens it in during the fourth day of creation week. With all those talk these days about a big bang that occurred billions of years ago and resulted in all the starry host humanity still find itself caught up in the same argument. For a christian like me however, there is no question. My faith i the fact that God created heaven and earth is not based on theory, some possible explanation. Instead my faith rests on a deep and abiding belief that God is the source of all things. As the holy Bible puts it on the book of Genesis 1:17-19 "And God set them in the firmament of the heaven to give light upon the earth, and to divide the light from the darkness: and God saw that it was good..."

Answer 4

I quite have it in my concepts that there are (a minimum of) 2 motives. (a million) as quickly as sufficient gasoline (and airborne dirt and dirt, yet in general gasoline) collapses right into a good ball, it ignites in fusion reaction. the warmth given off from this pushes a great style of something of the gasoline away. (2) that's extra significant than reason #a million. The galactic cloud has a great style of non-uniformity in it. some places are denser than others. in certainty, the dense factors are scattered around with virtually the comparable distribution because of the fact the celebs we see now. This video exhibits in basic terms some stars being shaped, so its not quite a style for a whole galaxy. whether it is going to, i desire, supply you a splash.