1. Smallest to Largest ?
Universe
Solar System
Galaxy

2. What objects are in the solar system?

3. Yakko’s Universe

4. Distances in Space

5. Units of Length ?

6. ASTRONOMICAL UNITS AU’s are used to measure within our solar system.
1 AU = 150 million km
1 AU = 93 million miles
1 AU = the distance from Earth to the Sun

7. Distance from the sun Planet km AU Mercury 57.9 million 0.39 Venus
0.72
Earth
149.6 million
1.0
Mars
227.9 million
1.5
Asteroid Belt
329.1 – million
Jupiter
778.3 million
5.2
Saturn
1.427 billion
9.5
Uranus
2.871 billion
19.2
Neptune
4.497 billion
30.0
Pluto
5.913 billion
39.4

8. LIGHT YEARS Speed of Light = 3.0 x 108 m/s
A Light-Year is the distance light travels in a year
1 Light Year = 95 Trillion Km or 6 trillion miles
the closest star, Alpha Centauri is 4.3 light-years away
the North Star is 431 light-years away
the Milky Way Galaxy is 100,000 light years in diameter