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Robert Nelson

on 5 November 2015

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Transcript of Galaxies

What is a galaxy?
Edwin Powell Hubble
The Tuning Fork
Spiral Galaxies
Elliptical Galaxies
Barred Spiral Galaxies
Irregular Galaxies
All galaxies consist of billions of stars
Galaxies come in a variety of shapes.
Hubble was an Astronomer.
In 1924, he developed a
system to classify galaxies.
To create this system he used
several items to classify the
type of galaxy
The most obvious feature of this
system is the shape of the galaxy
Shapes range from....
Elliptical... egg shaped
Spiral... whirlpool shaped
Barred Spiral... whirlpool with a bar
Irregular... exploded
Galaxies contain....
a central bulge,
and a flat disk.
Given the letter "E" followed by
a number ranging from 0 - 7
All central bulge
No arms
This is an "E1" Galaxy
This is an "E6" galaxy
Given the letter "S"
Followed by the letter "a", "b", or "c"
Spiral Galaxies have...
a central bulge,
a disk.
"Sa" Galaxies have....
A large central bulge.
A disk.
Few under-developed arms.
"Sb" Galaxies...
A smaller central bulge.
A disk.
More developed arms.
"Sc" Galaxy...
Small central bulge.
Many complex arms.
Given the letters "SB".
Followed by the letter "a", "b", or "c"
Identical to Spiral Galaxies.
The only difference is a bar of
stars running through the central
bulge. The arms are attached to
the bar.
Classification follows the same criteria
as a Spiral galaxy, except the development
of the bar is part of the classification.
SBa galaxies...
Large central bulge.
Little arm development.
Small bar of stars.
SBb galaxies...
Smaller central bulge.
A disk.
More developed arms.
A larger bar of stars.
SBc galaxies...
Small central bulge.
Complex arm development.
Large bar of stars.
Given the symbol "IRR"
Are irregular in shape.
Have no regular shapes
Our home galaxy is the "Milky Way".
It is a Sb class galaxy.
Newer evidence seems to indicate
our galaxy may be a SBb.
Full transcript