Our Place in Our Galaxy - PowerPoint PPT Presentation

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Our Place in Our Galaxy

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Our Place in Our Galaxy – PowerPoint PPT presentation

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Title: Our Place in Our Galaxy


1
Our Place in Our Galaxy
2
Solar System
3
MILKY WAY
4
Whats the Difference?
Image credits NASA, STScI
5
Whats the Difference?
6
Where is our Solar System?
Visible stars, gas, dust in the Milky Way Galaxy
Solar System here
Image credits NASA, STScI
7
How big is the Milky Way Galaxy?
100,000 light years
Image credits NASA, STScI
8
How far is 100,000 light years?
  • Consider this scale
  • 1 inch represents 5.5 light hours (Sun to Pluto)

1 mile represents 40 light years 2,500
miles represents 100,000 light years
9
Continent of North America!
10
(No Transcript)
11
And how thick is our Galaxy?
1000 light years
Credit NASA, COsmic Background Explorer (COBE)
Project
12
How thick is 1,000 light years?
If 2,500 miles represents 100,000 light years

25 miles represents 1,000 light years
13
200 BILLION Stars!!!
How many stars in Milky Way?
14
Fill with bird seed4 feet deep on a football
field
200 BILLION Stars!!!
15
Spread them over the continent 25 miles deep!
16
Solar System here
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