There are many types of galaxies, just like there are different countries, and different people. Yes, all them are unique and have their own individual characteristics. Galaxies are in motion and revolve around their center. In space there are big gaps of emptiness and in galaxies there are big gaps of emptiness...
It was the HUBBLE telescope that put galaxies into categories. It has been suggested in scientific circles that galaxies were once closer together but as the universe expands, these galaxies move farther and farther apart from each other.
Spiral Galaxies:
All spirals have a disc, a bulge and a halo. These galaxies are the most common when observing space around us and make up about 77% of all galaxies.
Barred Spiral Galaxies:
This type of galaxy shares the same characteristics as a spiral galaxy except in the middle of the galaxy there is a bar of stars where the bulge would be. There's little activity there and mostly older, redder stars are in the middle. Short bars in the middle make tighter spirals and longer bars make a spiral that is more spread out.
Elliptical Galaxies:
These galaxies are rather spherical and usually have a black hole within their nucleus. The middle is brighter than the spiral galaxies, Interestingly these galaxies are bright, round or cigar shaped, but not very active within. The stars are much older and not much new star formation takes place with in them.
A bit of a boring galaxy....
And finally the Irregular galaxies:
These galaxies have no definite shape but they contain neutron stars, black holes, gases and dust, along with elements from other stars. Only 20% of all our galaxies are irregular and they are in motion like the others as well.
Well, I suppose there are those who like organized spaces and those that like unorganized spaces. Each galaxy to its own!
No comments:
Post a Comment