Who developed the classification system that divides galaxies into spiral, elliptical, and irregular and classifies spirals by the size of their nuclear region and the tightness of winding of their arms?

Pain is transmitted to the brain by nerves. Major nerves move through the interior of the knee. Any twisting or pounding of the knee can cause bleeding and fluid...

There are a ton of extremely powerful telescopes both here on Earth and in space that is capable of looking billions of light years far. And we can see a...

Galaxies early on in their lives are actively forming hot, new stars and appear more bluish. Older galaxies are forming fewer new stars and their constituent stars are older on...

Elliptical galaxies are shaped like elipses. Spiral galaxies (like ours) have arms that make them look like a spiral. Irregular galaxies are all the others that don't fit the two...

The exact mechanism for the formation of the spiral arms continues to puzzle scientists. Scientists think they could be a result of density waves traveling through the outer disk....

Not directly related to the question, but excellent graphics of different galaxies!:

They may vary in size as other galaxies. The other forms are spiral and elliptic. If it is not one of those, it is an irregular galaxy.

It is said that the irregular galaxies were once spiral and elliptical but were deformed by an uneven external gravitational force. They contain much of gases and dust particles inside...

Stars in any form of galaxy are quite well separated except possible at the galactic centre. The only effect which can affect life is if a star goes supernova within...

During the early seventeenth century, organisms were classifed into two broad groups plants and animals by C, Linnaeus. But further detail study and discovery of nucleus structures, number of cells...