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Galaxies

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by

Kendall Sneyd

on 30 January 2014

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Transcript of Galaxies

Galaxies
inbetween the galaxies
-very low densities

-filled with dust and gas
Types of Galaxies
There are four types of galaxies:

-spiral
-elliptical
-lenticular
-irregular
Light Years
what are galaxies?
Galaxies
systems of millions or billions of stars, gas, dust and interstellar material held together by gravity

By Kendall Sneyd
and Eva Maksymiw

Irregular
galaxies
Galaxies
Spiral
Barred Spiral
Galaxies
Lenticular
Galaxies

M74 or NGC-628
Spiral galaxy
Andromeda or M31
Spiral Galaxy
NGC 1300
Barred Spiral Galaxy
NGC 4214
Irregular Galaxy
- From afar, these galaxies look like
swirling discs.
-The central bulge is composed of red
giants.
-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
Elliptical
Galaxies
-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

The Nucleus
NGC 1672
Barred Spiral Galaxy
-Distance not time

1 light year
= 9 500 000 000 km
M82 Starburst
Irregular Galaxy
NGC 1132
elliptical galaxy
NGC 4150
elliptical galaxy
NGC 5010
NGC 524
lenticular galaxy
lenticular galaxy
The Halo

Dark Matter
The Disk
The Milky Way
Our Galaxy
- 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
-spherical shape

- contains little gas, dust or star formation
Thank You!
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