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Transcript of Galaxies
inbetween the galaxies
-very low densities
-filled with dust and gas
Types of Galaxies
There are four types of galaxies:
what are galaxies?
systems of millions or billions of stars, gas, dust and interstellar material held together by gravity
By Kendall Sneyd
and Eva Maksymiw
M74 or NGC-628
Andromeda or M31
Barred Spiral Galaxy
- From afar, these galaxies look like
-The central bulge is composed of red
-The spiral arms are made of gas, dust and young stars
-These galaxies are a subclass of spiral galaxies.
-They share a similar appearance, however, barred spiral galaxies have a central bar.
- From the ends of the bars trail the spiral arms.
-Lenticular galaxies are thought to be very old spiral galaxies
-They have a central bulge but no spiral arms
-These galaxies are comprised of very old red stars.
-Irregular galaxies do not have clear shapes.
-They are made of more gas, dust and stars than galaxies with definite shapes.
-These galaxies do not have nuclei.
-Make up atleast 10% of all galaxies.
-100 million to 10 billion stars
-More than half of all galaxies are elliptical
-These galaxies are older, contain few young stars
-Little gas or dust
-round and flat or spherical
Barred Spiral Galaxy
-Distance not time
1 light year
= 9 500 000 000 km
The Milky Way
- Typical Barred Spiral Galaxy
-Contains up to 400 billion stars
-Most difficult to study
-there is more dark matter in the universe than all the stars, planets gas and dust combined
-we still don't know what exactly dark matter is
- is the centre of a galaxy
- small and very bright
- goes around the galaxy
-made up of dust and gas
- contains little gas, dust or star formation