Interactive Bradley Observatory Plaza

The Metro-Atlanta Scale Model Solar System (MASS) Project

The Metro-Atlanta Scale Model Solar System (MASS) project is an informal science education tool for the residents of Atlanta, focused on helping people understand the size and scale of our solar system and the planets within it.

The center of the model is located at Bradley Observatory, where the Sun is represented by an approximately 30 foot diameter plaza. At eight other locations throughout Metro-Atlanta (shown below), two large format panels have been installed. One panel shows the extent of the MASS and the location of each of the planets. A second panel shows a scaled image of the planet that would be found at that location in its orbit around the Sun.

Interactive Map of the Bradley Observatory Plaza Design

Click the planets in the design for more information.

Sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune

Sun

Sun

Distance from Earth: 149,597,900 km

Equatorial Radius: 695,500 km

The Sun - NASA's Solar System Exploration

Bradley Observatory, Agnes Scott College

Mercury

Mercury

Distance from the Sun: 57,909,175 km

Equatorial Radius: 2,439.7 km

Mercury - NASA's Solar System Exploration

Alston Campus Center, Agnes Scott College

Venus

Venus

Distance from the Sun: 108,208,930 km

Equatorial Radius: 6,051.8 km

Venus - NASA's Solar System Exploration

Decatur High School

Earth

Earth

Distance from the Sun: 149,587,890 km

Equatorial Radius: 6,378.14 km

Earth - NASA's Solar System Exploration

DeKalb County Public Library, Decatur Branch

Mars

Mars

Distance from the Sun: 227,936,640 km

Equatorial Radius: 3,397 km

Mars - NASA's Solar System Exploration

Columbia Theological Seminary

Jupiter

Jupiter

Distance from the Sun: 778,412,020 km

Equatorial Radius: 71,492 km

Jupiter - NASA's Solar System Exploration

Emory University, Physics Building

Saturn

Saturn

Distance from the Sun: 1,426,725,400 km

Equatorial Radius: 60,268 km

Saturn - NASA's Solar System Exploration

Georgia Tech, Physics Building

Uranus

Uranus

Distance from the Sun: 2,870,972,200 km

Equatorial Radius: 25,559 km

Uranus - NASA's Solar System Exploration

Atlanta Hartsfield-Jackson International Airport

Neptune

Neptune

Distance from the Sun: 4,498,252,900 km

Equatorial Radius: 24,764 km

Neptune - NASA's Solar System Exploration

Sweetwater Creek State Park

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