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Today:
Placing the Universe in Context:
Sizes & Scales
It’s All Relative & Units Matter
Earth is BIG
Home Base - Earth
Earth is BIG
Radius = 6378 km (3963 mi)
3rd Planet from the Sun
Earth is BIG
Home Base - Earth
Earth is Massive
Mass = 6x1024 kilograms (kg)
3rd Planet from the Sun
The Solar System is BIGGER
Earth is part of the Solar System
• One star (the Sun)
• Eight Major Planets
• 4 (or more?) Dwarf Planets
• 166+ moons
• Asteroids
• Comets
• A lot of Dust
We are here
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
The Solar System is BIGGER
Earth is part of the Solar System
• Terrestrial Planets: Mercury,Venus, Earth, Mars
• Jovian Planets: Jupiter, Saturn, Uranus, Neptune
• Mass of Jupiter = 318x Earth
We are here
318 Earth
masses
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
The Universe is BIG
Observable Universe
Local Universe
Virgo Supercluster
Local Group
The Milky Way
Local Stellar Neighborhood
Sun & Solar System
Earth
0.1 light-seconds around (25,000 miles)
1.3 light-seconds
8 light-minutes (1 Astronomical Unit)
The Universe is BIG
Observable Universe
Pluto: 5 light-hours
Local Universe
Virgo Supercluster
Local Group
The Milky Way
Nearest Star: 4 light-years
Local Stellar Neighborhood
Sun & Solar System
Earth
Orion: 1,500 light-years
Center of the Milky Way: 26,000 light-years
The Universe is BIG
Andromeda Galaxy: Observable Universe
2.5 Million light-years Local Universe
Virgo Supercluster
Local Group
Virgo Supercluster:
100 Million light-years
The Milky Way
Local Stellar Neighborhood
Sun & Solar System
Earth
Local Universe:
1 Billion light-years
Observable Universe:
93 Billion light-years
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