Why are galaxies flat and not spherical?
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Why are galaxies flat and not spherical?
When we picture the way objects organize around a center of gravity, we tend to imagine the shape of an atom, with the smaller objects orbiting around the nucleus forming a sphere around it. Galaxies are flat because of rotation. …
Why are galaxies flat instead of round?
Originally Answered: Why are most galaxies mostly flat? If gravity pulls objects in, wouldn’t they be spherical? They rotate around the center of all gravity in the galaxy as they form. This rotation prevents most of the galaxies from turning globular, although such specimens are also among galaxies.
Why are galaxies shaped the way they are?
All galaxies began with an elliptical shape, which is mostly a result of the centrifugal force of the spinning gas cloud. Like pizza dough being spun into the air the gas cloud flattens to a thin disk shape. Only the small center of the galaxy retains a spherical shape do to its slow rate of rotation and density.
Why is the Milky Way flat?
It’s actually several thousand light years thick… approximately 10,000 light years in the core, and about 3,000 out towards the galactic rim. However, the interplay between gravity and centrifugal force is what causes spiral galaxies like ours to “flatten out”.
Why are galaxies not spheres?
Gas clouds produce stars, and so most stars will also be in the plane of the disc. Very old clusters of stars in globular clusters however can be found in a spherical pattern around the disc. So galaxies form disc shapes because the gas that makes stars falls into a disc shape.
Why are galaxies spherical?
Stars and planets are spherical because gravity has pulled the material of those objects together into one unit, and when an object has enough mass, and because gravity acts equally from all directions, the result is a sphere. A galaxy is not a single unit, but billions or even trillions of these units combined.
Why are galaxies not a sphere?
Question: Why do stars and planets appear spherical when galaxies are flat? Answer: Galaxies aren’t completely flat. At the centre of every galaxy is a black hole, which is very dense matter that pulls everything towards it. That black hole is moving through space and spinning very fast.
Are galaxies circular or spherical?
There are spherical (or at least nearly spherical) galaxies! They fall into two basic categories – those elliptical galaxies that are pseudo-spherical in shape and the much smaller, so-called “dwarf spheroidal galaxies” that are found associated with our own Galaxy and other large galaxies in the “Local Group”.
Why are most galaxies spiral shaped?
Astronomers believe that galaxies have spiral arms because galaxies rotate – or spin around a central axis – and because of something called “density waves.” Stars pass through the wave as they orbit the galaxy center. The wave causes the stars to slow slightly and temporarily clump together.
Are all galaxies the same shape if not what shapes are common?
The simple answer is no! Galaxies don’t all look the same. We find that they come in two main shapes – spiral and elliptical. A third category – irregular – covers galaxies that don’t fit neatly into the spiral or elliptical classification.
Why is the Milky Way not a sphere?
Firstly our milkyway is a barred spiral galaxy because it is spiral in shape and has bars . The other type is elliptical galaxy. Generally young galaxies are spiral and they produce new stars and clusters actively while they become old turn to elliptical galaxy which doesn’t produce stars actively.
Why is Milky Way curved?
You simply cannot see the entire sky at once, nor can you photograph it in one shot with a standard lens. This is because the final photo is a flat projection of a curved sphere, which introduces distortion that ultimately makes the Milky Way appear curved in order to make the horizon appear flat.
Our galaxy is, on average, a hundred thousand light-years across but only a thousand light-years thick. Within this flattened (though somewhat warped) disc, the sun and its planets are embedded in a curving arm of gas and dust, putting the solar system about 26,000 light-years away from the galaxy’s turbulent core.
Why are the centers of galaxies so bright?
The reason why the centers of most galaxies, not just ours look bright is because that’s where the greatest concentration of stars is. Additionally many galaxies have AGNs (Active Galactic Nucleus) which are powered by supermassive black holes chomping on gas and other yummy cosmic substances.
What are facts about spiral galaxies?
Spiral galaxies are also known as disk galaxies. Spiral galaxies have a bulging center which is called the bulge. The bulge of a spiral galaxy contains old stars and a black hole. Sometimes galaxies merge with each which causes them to grow bigger or they are destroyed all together.
How many planets are in the Milky Way?
8 planets in the solar system (maybe 9)