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Robert Nelson

on 25 September 2017

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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
In the center of galaxies, lie the source of gravity.
This source could be billions of stars packed closely together, or it could be massive black holes.
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 the tuning fork 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.
What caused the formation of galaxies?
Galaxies formed when the mutual gravitational attraction of stars, made them form clumps.
The clumps ended up being the center of gravity for billions of stars.
Gravity determines the shape of the galaxy.
The tuning fork represents the evolution of galaxies from left to right
Full transcript