How are Galaxies born?

Answer 1

Current cosmological models of the early Universe are based on the Big Bang theory. About 300,000 years after this event, atoms of hydrogen and helium began to form, in an event called recombination. Nearly all the hydrogen was neutral (non-ionized) and readily absorbed light, and no stars had yet formed. As a result this period has been called the "Dark Ages". It was from density fluctuations (or anisotropic irregularities) in this primordial matter that larger structures began to appear. As a result, masses of baryonic matter started to condense within cold dark matter halos. These primordial structures would eventually become the galaxies we see today.
Evidence for the early appearance of galaxies was found in 2006, when it was discovered that the galaxy IOK-1 has an unusually high redshift of 6.96, making it the most distant galaxy yet seen. While some scientists have claimed other objects (such as Abell 1835 IR1916) have higher redshifts (and therefore are seen in an earlier stage of the Universe's evolution), IOK-1's age and composition have been more reliably established. The existence of such early protogalaxies suggests that they must have grown in the so-called "Dark Ages".
The detailed process by which such early galaxy formation occurred is a major open question in astronomy. Theories could be divided into two categories: top-down and bottom-up. In top-down theories (such as the Eggen–Lynden-Bell–Sandage [ELS] model), protogalaxies form in a large-scale simultaneous collapse lasting about one hundred million years.In bottom-up theories (such as the Searle-Zinn [SZ] model), small structures such as globular clusters form first, and then a number of such bodies accrete to form a larger galaxy.Modern theories must be modified to account for the probable presence of large dark matter halos.
Once protogalaxies began to form and contract, the first halo stars (called Population III stars) appeared within them. These were composed almost entirely of hydrogen and helium, and may have been massive. If so, these huge stars would have quickly consumed their supply of fuel and became supernovae, releasing heavy elements into the interstellar medium. This first generation of stars re-ionized the surrounding neutral hydrogen, creating expanding bubbles of space through which light could readily travel.

Answer 2

Galaxies are born as a swarm of little galaxies, that merge to form bigger galaxies.

Galaxies are born in the early Universe. The current best model for the early Universe is an "inflationary Lambda cold-dark-matter Omegea = 1 Big Bang", based various lines of evidence too numerous to go into here. Such a Universe starts off hot, dense, and almost (but not quite) perfectly smooth. The dynamics are dominated by the cold dark matter, which is affected by gravitation but otherwise does not interact with other matter or with itself. Tens of millions of years after the Big Bang, the gravitational effect of the slightly denser bits of dark matter begins to take effect, and dark matter begins to accumulate in these slightly denser places. Initially, the blobs of dark matter that form are fairly small---only a few thousand times the mass of the Sun. These grow by drawing in more dark matter and some normal matter, and become small dwarf galaxies. Since the Universe is still dense about a billion years after the Big Bang, these galaxies are close to each other and begin to collide and merge. Over the next few billion years, these small dwarf galaxies collide and merge to form bigger galaxies, eventually making the galaxies we see today.

Answer 3

Galaxies are an end stage in the evolution of the universe.
Gravity pulls them together over billions of years.
Angular momentum flattens them and sets them spinning.
They are not satellite systems so the arms rotate locked in step with the galactic center.
The arms do not fly off due to neutron star activity at the galactic center.
The process at the galactic center will eventually result in the annihilation of the galaxy.

Answer 4

Well, according to Bertrand Russell... "Big swirls have little swirls that feed on their velocity and little swirls have lesser swirls and so on to viscosity."

Now, if you don't understand that answer then you don't know enough about gravity and relativity to understand a really technical answer about how Galaxies are born.... there is NO one line answer for your question... sorry.!

Answer 5

When gas and dust form stars, and then their gravity forms this little elliptical place where they turn and when some die then more stars are born, branching out into spirals.

Answer 6

momma galaxy and poppa galaxy get together behind closed doors and 9 months later baby galaxy pops out

Answer 7

God creates them.