Science 10.2
Galaxies
The 3 Galaxy Shapes
Spiral Galaxy
-Has many spiralling arms coming our from the centre core
-Very flat
-Milky Way is a spiral galaxy
Elliptical Galaxy
-Ranges from perfect sphere to stretched out ellipse
-Contain old stars
-50% of galaxies are elliptical
-Largest galaxies
Irregular Galaxy
-Does not have a regular shape
-Both new and old stars
Differences Between Galaxies
-Colour
-Number of stars
-Brightness
-Size
-Mass
-Speed of Spin
-Type of stars
-Amount of dust
-Amount of gas
Types of Star Clusters
Globular Cluster
-Held together by mutual gravity
-Up to 1,000,000 stars
Open Cluster
-From a few hundred to tens of thousands of stars
*Nebula*
-Cloud of dust and gas
-Often produces new stars
-Sometimes from a collapsed old star