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The Sunsphere is a tall
hexagon In geometry, a hexagon (from Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°. Regular hexagon A regular hexagon is de ...
al
steel Steel is an alloy of iron and carbon that demonstrates improved mechanical properties compared to the pure form of iron. Due to steel's high Young's modulus, elastic modulus, Yield (engineering), yield strength, Fracture, fracture strength a ...
truss A truss is an assembly of ''members'' such as Beam (structure), beams, connected by ''nodes'', that creates a rigid structure. In engineering, a truss is a structure that "consists of two-force members only, where the members are organized so ...
structure located in World's Fair Park in downtown
Knoxville, Tennessee Knoxville is a city in Knox County, Tennessee, United States, and its county seat. It is located on the Tennessee River and had a population of 190,740 at the 2020 United States census. It is the largest city in the East Tennessee Grand Division ...
, United States. It is topped with the gold-colored glass
sphere A sphere (from Ancient Greek, Greek , ) is a surface (mathematics), surface analogous to the circle, a curve. In solid geometry, a sphere is the Locus (mathematics), set of points that are all at the same distance from a given point in three ...
that served as the symbol of the 1982 World's Fair. Directly across a man-made pond from the Tennessee Amphitheater, they are the only remaining structures from the fair.


Design

Designed by the Knoxville-based
architectural firm In the United States, an architectural firm or architecture firm is a business that employs one or more licensed architects and practices the profession of architecture; while in South Africa, the United Kingdom, Ireland, Denmark and other countr ...
Community Tectonics, the Sunsphere was noted for its unique design in several
engineering Engineering is the practice of using natural science, mathematics, and the engineering design process to Problem solving#Engineering, solve problems within technology, increase efficiency and productivity, and improve Systems engineering, s ...
publications. It was originally to have had a diameter of symbolically that of the hypothetical diameter of the disc of the
Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...
. The tower's window glass panels are layered in 24-karat
gold Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal ...
dust and cut to seven different shapes. It weighs and features six double
steel Steel is an alloy of iron and carbon that demonstrates improved mechanical properties compared to the pure form of iron. Due to steel's high Young's modulus, elastic modulus, Yield (engineering), yield strength, Fracture, fracture strength a ...
truss A truss is an assembly of ''members'' such as Beam (structure), beams, connected by ''nodes'', that creates a rigid structure. In engineering, a truss is a structure that "consists of two-force members only, where the members are organized so ...
columns in supporting the seven-story sphere. The tower has a volume of and a surface of .


History

During the fair it cost to take the elevator to the tower's
observation deck An observation deck, observation platform, or viewing platform is an elevated sightseeing platform usually situated upon a tall architectural structure, such as a skyscraper or observation tower. Observation decks are sometimes enclosed from we ...
. The tower served as a restaurant and featured food items such as the "Sunburger" and a rum and fruit juice cocktail called the "Sunburst". In the early morning hours on May 12, 1982, a shot was fired from outside the fair site and shattered one of the sphere's windows. No one was arrested for the incident. The Sunsphere has been used as a symbol for Knoxville, appearing in postcards and
logo A logo (abbreviation of logotype; ) is a graphic mark, emblem, or symbol used to aid and promote public identification and recognition. It may be of an abstract or figurative design or include the text of the name that it represents, as in ...
s. Between 1993 and 1999, the Sunsphere was featured in part on the logo for the
Knoxville Smokies The Knoxville Smokies are a Minor League Baseball team based in Knoxville, Tennessee. The team, which plays in the Southern League, is the Double-A affiliate of the Chicago Cubs. The team was based in Kodak, Tennessee, a Knoxville suburb, fr ...
minor league baseball Minor League Baseball (MiLB) is a professional baseball organization below Major League Baseball (MLB), constituted of teams affiliated with MLB clubs. It was founded on September 5, 1901, in response to the growing dominance of the National Le ...
club. The 2002 AAU Junior Olympics
mascot A mascot is any human, animal, or object thought to bring luck, or anything used to represent a group with a common public identity, such as a school, sports team, university society, society, military unit, or brand, brand name. Mascots are als ...
''Spherit'' took its inspiration from the landmark. It featured red hair and a body shaped like the Sunsphere. On Sunday, May 14, 2000,
nuclear weapons A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either nuclear fission, fission (fission or atomic bomb) or a combination of fission and nuclear fusion, fusion reactions (thermonuclear weap ...
protesters scaled the tower and hung a large banner saying "Stop the Bombs". They remained on the tower for three days before surrendering to police.


Redevelopment

In March 1991, officials from the Pensacola Tornados of the
Continental Basketball Association The Continental Basketball Association (CBA), originally known as the Eastern Pennsylvania Basketball League, and later as the Eastern Professional Basketball League and the Eastern Basketball Association, was a men's professional basketball m ...
were looking at Knoxville for possible location and said of the Sunsphere as potential office space, "What better place for basketball offices than a giant gold basketball in the sky." In March 1994 the World's Fair Park Development Committee sought to reopen the Sunsphere as a restaurant (similar to
Seattle Seattle ( ) is the most populous city in the U.S. state of Washington and in the Pacific Northwest region of North America. With a population of 780,995 in 2024, it is the 18th-most populous city in the United States. The city is the cou ...
's
Space Needle The Space Needle is an observation tower in Seattle, Washington, United States. Considered to be an icon of the city, it has been designated a List of Seattle landmarks, Seattle landmark. Located in the Lower Queen Anne, Seattle, Lower Queen An ...
, which features a restaurant at the top): CEB Enterprises would have opened a casual dining restaurant called World's Fare Restaurant; Cierra Restaurant Group would have opened a fine dining restaurant. Both proposals failed. The Sunsphere was proposed to be included as part of the new Knoxville Convention Center. While not physically incorporated into the final design, the Convention Center was designed with an open curve along its north edge to allow access to the Sunsphere. During construction of the Convention Center, the observation deckwhich the city had briefly reopened, still sporting the original World's Fair-era displays and explanations of the panoramawas closed while the tower was commandeered by the Knoxville Public Building Authority as offices for, quite literally, overseeing construction of the Convention Center.


Reopening

The Level 4 observation deck was reopened on July 5, 2007, to give visitors a view of Knoxville. The observation deck can hold 86 people. At the time of its reopening, Level5 became a cafe with concession and an early evening drinks service. Level6 served as an open space leased out for functions. As of October 2013, both the 7th and 8th floors are available for commercial rental. On August 27, 2008, the 5th floor was opened as the SkyBox bar and lounge. It eventually closed, however, and real estate investor Tony Capiello opened Icon Ultra Lounge in its place, investing $450,000. In June 2013, a patron accidentally broke an inside window; nobody was hurt. On November 13, 2013, it was announced that Visit Knoxville would update and renovate the 4th floor of the observation deck. The Sunsphere observation deck was closed in 2020 due to the COVID-19 pandemic. Visit Knoxville reopened the Sunsphere observation deck on February 22, 2022. The floor offers a 360-degree view stretching from downtown to the Great Smoky Mountains, including World's Fair Park, the Tennessee River, and the University of Tennessee Campus. Visitors can also view a 1982 World's Fair timeline, gallery, memorabilia, and gift shop.


In popular culture

A March 1996 episode of ''
The Simpsons ''The Simpsons'' is an American animated sitcom created by Matt Groening and developed by Groening, James L. Brooks and Sam Simon for the Fox Broadcasting Company. It is a Satire (film and television), satirical depiction of American life ...
'', " Bart on the Road", features the Sunsphere.
Bart Bay Area Rapid Transit (BART) is a rapid transit system serving the San Francisco Bay Area in California. BART serves List of Bay Area Rapid Transit stations, 50 stations along six routes and of track, including eBART, a spur line running t ...
and three friends (
Nelson Nelson may refer to: Arts and entertainment * ''Nelson'' (1918 film), a historical film directed by Maurice Elvey * ''Nelson'' (1926 film), a historical film directed by Walter Summers * ''Nelson'' (opera), an opera by Lennox Berkeley to a lib ...
,
Martin Martin may refer to: Places Antarctica * Martin Peninsula, Marie Byrd Land * Port Martin, Adelie Land * Point Martin, South Orkney Islands Europe * Martin, Croatia, a village * Martin, Slovakia, a city * Martín del Río, Aragón, Spain * M ...
, and Milhouse) travel to Knoxville to visit the World's Fair, only to learn they are over a decade too late. In the episode, the Sunsphere has become a dilapidated storage warehouse for a wig store called the Wigsphere. Nelson then throws a rock at the Sunsphere, causing it to topple over and land on top of their rental car, destroying it and stranding them in Knoxville. The Sunsphere has also been called "The Lord's Golf Tee".


References


Further reading

*


External links


The Sunsphere
(World's Fair Park website) {{Knoxville, Tennessee 1982 establishments in Tennessee buildings and structures completed in 1982 buildings and structures in Knoxville, Tennessee buildings and structures with revolving restaurants culture of Knoxville, Tennessee restaurants established in 1982 restaurants in Tennessee tourist attractions in Knoxville, Tennessee towers in Tennessee world's fair architecture in Tennessee 1982 World's Fair Symbols of cities