Galaxies are flat because of the way gravity and angular momentum interact during their formation. As gas and dust collapse to form a galaxy, the rotation causes it to flatten out into a disk shape. This rotation helps balance the inward pull of gravity, resulting in a flat, disk-like structure.
As the universe expands, the density of galaxies decreases. This is because the space between galaxies increases as the universe expands, leading to a lower concentration of galaxies in a given volume of space.
Yes, there is believed to be an infinite number of galaxies in the universe.
Yes, many galaxies have supermassive black holes at their centers.
Peculiar velocities are the individual speeds at which galaxies move within the universe, separate from the overall expansion of the universe. They differ from the general motion of galaxies because they are influenced by local gravitational interactions between galaxies.
Not all galaxies have a black hole at their center. Some galaxies, like our own Milky Way, do have a supermassive black hole at their center, while others do not.
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born
Galaxies may have any of four general shapes. Elliptical galaxies show little or no structure and vary in general shape from moderately flat and round or oval to spherical. Spiral galaxies have a small, bright central region, or nucleus, and arms that come out of the nucleus and wind around, trailing off like a giant pinwheel. In barred spiral galaxies, the arms extend sideways in a short straight line before turning off into the spiral shape. Both kinds of spiral systems are flat. Irregular galaxies are usually rather small and do not have a symmetrical shape.
they don't see it flat they actually go out into the space and look at the galaxies, milky ways and more in the solar system.
The universe isn't flat. It is 3-Dimensional time and space. Galaxies are depicted as being donut shaped and flat
No, galaxies are three dimensional. Do you mean are there galaxies without a bulge in the center? That answer is yes. Some are shaped like balls, some have irregular shapes, and the rest (which is really most of them) are shaped like discs. Almost all disc-shaped galaxies have a bulge in them, but there are a few that do not have any bulge at all- they are flat discs. Just like a CD.
That is a difficult question to fully answer as types of galaxies are not fully defined. A ball park figure would be dwarf galaxies, or spiral galaxies depending on the area in question. See related question for a full breakdown.
The three different types of galaxies are the Spiral galaxy, the Elliptical galaxy, and the Irregular galaxy. Spiral galaxies are obviously in the shape of a spiral, elliptical galaxies are shaped as an ellipse, or a flat circle, and irregular galaxies can be any shape.
Both the Milky Way and the Andromeda galaxies are flat spirals in shape.
galaxie 1, 2, 3, 4 and 5
Both the Milky Way and the Andromeda galaxies are flat spirals in shape.
We don't for sure as our vantage point does not allow us to determine that. However, by viewing other spiral galaxies (Andromeda, Sombrero galaxies) we can make a calculated guess that our galaxy is shaped in the same way.Also, while we can't see the galaxy as a whole, what we can see is consistent with it being a flat disk... specifically, we can even tell that it appears to be a barred spiral galaxy.
who discovered the galaxies who discovered the galaxies