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A galaxy is formed when a nebula collapses under the force of gravity of the matter that it contains. The process of collapsing imparts a rotational momentum to the galaxy. It is this rotational motion which gives galaxies their characteristic disk shape.

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What galaxy is shaped like a disk?

Most galaxies are shaped like a disk. It's the way they are formed. One of the most beautiful is the Sombrero Galaxy. [See related link for a picture]


How many galaxies are formed in the universe?

There is no correct answer as most are not discovered


Scientists believe that the more distant galaxies formed?

Scientists believe that galaxies formed earlier in the universe's history, with the most distant galaxies being some of the first to have formed after the Big Bang. Studying these distant galaxies can provide insights into the early stages of galaxy formation and evolution.


Do stars form into galaxies?

Galaxies are vast collections of stars. So I guess you could say that a big group of stars forms a galaxy. Our galaxy has many big clusters of stars within it, so not all star clusters are galaxies. If you have a cluster of several million or billion (or trillion) stars surrounded by a lot of empty space, that is probably a galaxy.


What is one way that an elliptical galaxy differs from the other types of galaxies?

Elliptical galaxies are large blob shaped galaxies that most galaxies will eventually look like. Elliptical galaxies are what happens when two or more large galaxies collide and coalesce.


What shape is the solar system?

The solar system is roughly a flat, disk-like shape, with most planets orbiting the Sun in relatively the same plane. This configuration is due to the way the solar system formed from a rotating cloud of gas and dust, which flattened out into a disk as the planets formed.


How long ago did the galazies form?

Galaxies began forming around 13.6 billion years ago, not long after the Big Bang that created the universe. Over time, gravity caused matter to clump together, eventually forming the galaxies we observe today.


How do you get a black hole?

Virtually all the ones we know anything about probably formed as the result of the death of a very large star, or at the centers of galaxies. Most if not all galaxies have super massive black holes at their centers.


How are spiral arms related to the disk?

Spiral arms are prominent features of spiral galaxies and are closely related to the galactic disk, where most of the galaxy's stars, gas, and dust are concentrated. They are formed by the density wave theory, where the gravitational influence of stars and gas creates waves of higher density that propagate through the disk, leading to the formation of stars and maintaining the spiral structure. These arms are not static; they move through the disk as new stars are continuously born and older stars move out of the arms. Thus, spiral arms are dynamic features that reflect the ongoing processes within the galactic disk.


How are galaxies most commonly classified in the field of astronomy?

Well, isn't that just a delightful question! Galaxies, my oh my, they are commonly classified based on their shapes - things like spiral, elliptical, and irregular. It's like painting the stars with different brushstrokes, each one unique and special in its own way. Keep exploring the universe, there's so much beauty out there waiting to be discovered.


Why is the Sun 332900 times the mass of the Earth?

When the solar system formed the vast majority of the mass fell right to the center and formed the sun. Less than 1% of the remaining mass formed a disk of gas and dust around the sun. Most of the mass of the disk was hydrogen and helium, which was blown out of the inner solar system by the solar wind. Most of the material left behind was rock and iron dust, which formed the four innermost planets and the asteroid belt. The greatest portion of the rock and metal went into forming Earth, though that still represented only a tiny portion of the mass of the original disk. Most of the matter in the disk around the sun went in to forming Jupiter.


Why does Jupiter have the highest number of satellites?

As the largest and most massive planet, Jupiter formed a disk (proto-planetary type disk) all of its own and from this disk a number of satellites coalesced. It has also 'trapped' several objects that came close to it.