Shape, or morph. The spiral galaxies, elliptical galaxies, lenticular, barred spiral, and irregular galaxies all are different shapes or morphs of galaxies, and so they are classified differently.
Galaxies are actually classified by their appearance. Some of these categories include ellipticals and spirals. There are hundreds of billions of galaxies.
http://amazing-space.stsci.edu/resources/explorations/galaxies-galore/teacher/scientificbackground.html #6
I'm not sure if this hepls, but i think the answer is:
by mass, luminosity, temperature and diameter (absolute magnitude).
- good luck!
The classification of galaxies is an attempt to make sense of what is observed using telescopes to study galaxies.
Shape
Edwin Powell Hubble, the American astronomer, demonstrated the existence of other galaxies besides the Milky Way.
the hubble telescope edwin hubble :)
Mister Edwin Hubble did just that, before the 1920's, many astronomers thought that our galaxy included everyobject in space, in 1924 Edwin Hubble proved that other galaxies existed beyond the milky way
He invented a system for classifying galaxy morphologies (shapes). The Hubble Space Telescope is named after him, but he did not invent it.
In 1962, astronomer Edwin Hubble decided to classify galaxies according to a logical scheme. he eventually decided to classify them according to their shape. Today, galaxies are divided into four main groups: spiral, barred spiral, elliptical, and irregular.
Edwin Hubble
Edwin Powell Hubble, the American astronomer, demonstrated the existence of other galaxies besides the Milky Way.
In the late 1920s, the astronomer Edwin Hubble discovered that most of the galaxies he observed were moving away from Earth.
the hubble telescope edwin hubble :)
In the late 1920s, the astronomer Edwin Hubble discovered that most of the galaxies he observed were moving away from Earth.
Edwin Hubble was an astronomer.He proved that there are a lot of other galaxies out there.He proved that those galaxies are moving away from us and the universe is expanding.
Mister Edwin Hubble did just that, before the 1920's, many astronomers thought that our galaxy included everyobject in space, in 1924 Edwin Hubble proved that other galaxies existed beyond the milky way
Edwin Hubble was famous for measuring the red shift of distant galaxies and interpreting that as evidence of the expansion of the Universe.
Edwin Hubble proved that there are other galaxies spread throughout the universe, and that these galaxies move away from each other as the universe expands. He further found that the galaxies in the outermost areas of the universe move faster that those nearer the middle, a feature in his Hubble's Law.
Edwin Hubble
Edwin Hubble
Edwin Hubble.