Just their shapes, as see through a telescope.
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Eliptical galaxies have older stars than spirals and elipticals are oval-shaped.
The Milkyway and irregular galaxy are both galaxies,the only difference is the shape. The irregular is a twisted and irregular shape while the milky way is a spiral kind of.
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
Yes, lenticular galaxies are lens-shaped. They will not have spiral arms.
a dinamiter of 800,00
the elliptical galaxy has a round or oval shape the spiral galaxy has a hurricane shape The origin of these different shapes would lie in the particular momentum of the constituent stars at the time they first coalesced into a galaxy under their mutual gravitational attraction.
All galaxies appear to be unique; they are all equally uncommon. Except ours; the Milky Way is the only galaxy to have US in it. Edit : Galaxies are classified into various types. The most uncommon type is known as "Irregular".
It means with irregular polygons
A Lenticular Galaxy is a galaxy that is in between that of a elliptical and a spiral galaxy. They are disc galaxies that have used up all of their interstellar material and therefore have little, if any, star formation. They can be difficult to distinguish between elliptical galaxies if viewed side on. See related links for more information and pictorial representation
Galaxies have different shapes because of what happens throughout their lives. Any galaxy, at one point or another, will encounter another or many galaxies. When encounters occur, gravity takes over. The larger of the two galaxies will consume the smaller one, this is called galactic cannibalism. The act of absorbing another galaxy will change the size of the galaxy it's shape and even the speed of its rotation. Our own galaxy, The Milky Way, is as large it is (100000-150000 Light years across.) because of galactic cannibalism. The Milky Way is as we speak consuming two other small galaxy. And in about 2 billion years, our nearest nieghbor, the Andromeda Galaxy, will collide with our galaxy. Both the Milky Way and Adromeda galaxy are spiral galaxies, but after they collide the resulting new galaxy will an elliptical galaxy, which looks like a bright white sphere.
The four groups of galaxies are put into groups by the way they look, Spiral galaxies like our vary own milky way have tentacle like arms that make a spiral, there are also barred spiral galaxies that have only two arms in which give it a bar like appearance like the sculptor galaxy. We also have the elliptical and irregular galaxies. Elliptical galaxies have an ellipsoid or.. egg shaped look to them, Irregular galaxies don't have a particular look to them .. its and odd galaxy for sure one that always looks different from other galaxy. So i would say there classes depend on how they look.. there characteristics.
The bar.