Both structures contain huge numbers of stars.
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
spiral, eliptical, cartwheel, barred spiral, and lenticular galaxies
Eliptical galaxies have older stars than spirals and elipticals are oval-shaped.
There are generally three types of galaxies: spiral galaxies, elliptical galaxies, and irregular galaxies. Spiral galaxies like the Milky Way have a disk shape with arms of stars spiraling out from a central core. Elliptical galaxies are shaped like ellipses and contain mostly older stars. Irregular galaxies have a less defined shape and tend to have a mix of young and old stars.
The bar.
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.
Spiral galaxies get their beautiful structure from tidal interactions between galaxies.
Approximately 60% of all galaxies are spiral
It's not known to any degree of accuracy, but about 66% of all spiral galaxies are barred and about 60% of galaxies in the local Universe are spiral galaxies.
Yes. There are two types of spiral galaxies: "S" (normal spiral) and the less common "SB" (barred spiral, with an elongated center).
galaxie 1, 2, 3, 4 and 5