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Spiral Galaxies
Spiral galaxies, which number about half of all galaxies, show a
disk-like distribution of matter, in which the youngest, brightest
stars outline the distinctive spiral arms. Spiral galaxies are
characterized by elongated spiral arms and a central bulge. There is
quite a range of variability in size, shape, and aspect ratio of
arms/bulge. The Milky Way is a spiral galaxy.
Here is a picture of a spiral galaxy (the Messier 51 or Whirpool
Galaxy) seen face on with respect to us. This galaxy has also a baby
galaxy attached to it (right hand side).
The image above is of a spiral galaxy, NCG4565, seen edge on.
The M100 spiral galaxy imaged by the Hubble space telescope, before
(left) and after (right) the correction to the lens system. The galaxy
is tens of millions light years away from us. (Credit: PHOTO RELEASE
NO.: STScI-PR94-01 - Space Telescope Science Institute)
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