Other Components of the Universe

1
Other Components of the Universe

• Section 9.6

2
Star Clusters

• A group of stars held together by gravity
• Open star clusters collections of 6 to 1000s of
  younger stars
• Globular clusters ball shaped collection of
  1000s to 1000000s of very old stars

3
Galaxies

• Collections of millions/billions of stars,
  planets, gas and dust measuring up to 100 000 ly
  across.
• Come in different shapes/sizes
• Elliptical spherical to flat oval shape
• Spiral spinning pinwheels
• Lenticular central bulge surrounded by
  flattened disc
• Irregular no definite shape

4
The Milky Way

• 2 spiral arms, central bulge of old stars, disc
  of newer stars around the bulge
• Our solar system is located on the inner edge of
  one of the spiral arms (26 000 ly from the inner
  core).
• There is a supermassive black hole at the center

5
Quasars Powerhouse of Energy

• They are distant, young galaxies that emit large
  amounts of energy produced by a supermassive
  black hole at its centre.
• The central region is more luminous than normal
  they look like stars though a telescope

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Todays Tasks

• Pg. 387 Classifying Galaxies
• Complete 1, A-E (yesE will be homework)
• Pg. 391 1, 6, 8