The sky (also sometimes called celestial dome) is everything that lies above the surface of the Earth, including the atmosphere and outer space.

In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting. The celestial sphere is conventionally divided into designated areas called constellations.

Usually, the term sky informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome (sometimes called the sky bowl) appearing flatter during the day than at night. In some cases, such as in discussing the weather, the sky refers to only the lower, denser layers of the atmosphere.

The daytime sky appears blue because air molecules scatter shorter wavelengths of sunlight more than longer ones (redder light). The night sky appears to be a mostly dark surface or region spangled with stars. The Sun and sometimes the Moon are visible in the daytime sky unless obscured by clouds. At night, the Moon, planets, and stars are similarly visible in the sky.

Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation are also visible in the sky. Certain birds and insects, as well as human inventions like aircraft and kites, can fly in the sky. Due to human activities, smog during the day and light pollution during the night are often seen above large cities.

Sky Media

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My.. Water.
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ISS042E135486 (01/10/2015) --- Just another sunny day in the Caribbean sea as viewed by astronauts aboard the International Space Station. This image was tweeted out by NASA astronaut Terry Virts as he captured the Earth observation of #Cuba and #Bahamas on Jan. 10, 2015. iss042e135486

ISS042E135486 (01/10/2015) --- Just another sunny day in the Caribbean...

ISS042E135486 (01/10/2015) --- Just another sunny day in the Caribbean sea as viewed by astronauts aboard the International Space Station. This image was tweeted out by NASA astronaut Terry Virts as he captured... More

Smokestacks and bridge of a steamboat docked at Jackson Square on the Mississippi River, New Orleans, Louisiana
Space Shuttle Discovery, STS-51 G Launch

Space Shuttle Discovery, STS-51 G Launch

(June 17, 1985) On June 17, 1985, Space Shuttle Discovery's STS-51 G mission launched on a Comsat deployment mission. It deployed three communication satellites. The mission lasted a little over seven days. ..I... More

Færdselsbetjent, Sven Turck Photos

Færdselsbetjent, Sven Turck Photos

Traffic officer..KB id: turck_58725..Photo: Sven Türck (1897-1954)..Department of Maps, Prints and Photographs, The Royal Library, Denmark.

The wall of Tuan Cheng (Circular City) in Beihai Park

The wall of Tuan Cheng (Circular City) in Beihai Park

Format: Hand painted lantern slides...Rights Info: No known restrictions on publication...Part Of: Powerhouse Museum Collection.. ( http:// ) .. 414801 ( http:// 414801 ) ..Acquisition credit line: G... More

Young women at the municipal casino: Lido Beach, Florida

Young women at the municipal casino: Lido Beach, Florida

Local call number: JJS0370..Title: Young women at the municipal casino: Lido Beach, Florida..Date: ca. 1945..Physical descrip: 1 transparency - col. - 5 x 4 in...Series Title: Joseph Janney Steinmetz Collection... More

Puerto Rico, Southern Methodist University collection

Puerto Rico, Southern Methodist University collection

Title: Puerto Rico . .Creator: Robert Yarnall Richie ..Date: 1939..Place: Puerto Rico..Physical Description: 1 transparency: film, color; 10 x 13 cm. . .File: ag1982_0234_2063_K_14_sm_opt.jpg . ... More

P.R. - Morro Castle, Southern Methodist University collection

P.R. - Morro Castle, Southern Methodist University collection

Title: P.R. - Morro Castle ..Alternative Title: [Fort San Felipe del Morro, Puerto Rico]. .Creator: Robert Yarnall Richie. .Date: 1939..Place: San Juan, Puerto Rico..Physical Description: 1 transparency: ... More

[Braniff Airline Pilots Watching a Lockheed 12A Electra Junior]

[Braniff Airline Pilots Watching a Lockheed 12A Electra Junior]

Title: [Braniff Airline Pilots Watching a Lockheed 12A Electra Junior]..Creator: Robert Yarnall Richie ..Date: March 1940..Place: Houston, Texas ..Part Of: Robert Yarnall Richie Photograph Collection..Descripti... More

Pasadena Community drive-in church: St. Petersburg, Florida

Pasadena Community drive-in church: St. Petersburg, Florida

: www.floridamemory.com/items/show/245088 ( http://www.floridamemory.com/items/show/245088 ) ..Local call number: JJS0180..Title: Pasadena Community drive-in church: St. Petersburg, Florida..Date: ca. 1947..Phy... More

Unidentified woman holding gladiolus at Terra Ceia Island Farms, Florida

Unidentified woman holding gladiolus at Terra Ceia Island Farms, Flori...

: www.floridamemory.com/items/show/245323 ( http://www.floridamemory.com/items/show/245323 ) ..Local call number: JJS0361A..Title: Unidentified woman holding gladiolus at Terra Ceia Island Farms, Florida..Date:... More

Lois Duncan Steinmetz gazing at the Suwannee River

Lois Duncan Steinmetz gazing at the Suwannee River

Local call number: JJS0379..Title: Lois Duncan Steinmetz gazing at the Suwannee River..Date: 1949..Physical descrip: 1 transparency - col. - 5 x 4 in...Series Title: Joseph Janney Steinmetz Collection ( http://... More

Nora Carrol and Lois Duncan Steinmetz: Sarasota, Florida

Nora Carrol and Lois Duncan Steinmetz: Sarasota, Florida

Local call number: JJS0202..Title: Nora Carrol and Lois Duncan Steinmetz: Sarasota, Florida..Date: November 1949..Accompanying Note: "Fill-in shots done on Cover-girl sequence for Collier's."..Physical descrip:... More

Lois Duncan Steinmetz (left) and Polly Gaines in a motorboat: Sarasota, Florida

Lois Duncan Steinmetz (left) and Polly Gaines in a motorboat: Sarasota...

Local call number: JJS0214..Title: Lois Duncan Steinmetz (left) and Polly Gaines in a motorboat: Sarasota, Florida..Date: 1950..Physical descrip: 1 transparency - col. - 4 x 5 in...Series Title: Joseph Janney S... More

Texaco, Southern Methodist University collection

Texaco, Southern Methodist University collection

Title: Texaco ..Creator: Robert Yarnall Richie ..Date: ca. August 12, 1963 - November 25, 1963..Place: Fairbanks, Texas..Physical Description: 1 transparency: film, color; 10 x 13 cm. ..File: ag1982_0... More

[Statue of Liberty at Dusk]

[Statue of Liberty at Dusk]

Title: [Statue of Liberty at Dusk]..Creator: Robert Yarnall Richie, 1908-1984..Date: November 9, 1965..Place: New York Harbor, Manhattan, New York..Part Of: Robert Yarnall Richie photograph collection..Descript... More

[Statue of Liberty with Lower Manhattan in Background]

[Statue of Liberty with Lower Manhattan in Background]

Title: [Statue of Liberty with Lower Manhattan in Background] ..Creator: Robert Yarnall Richie, 1908-1984..Date: November 9, 1965..Place: New York Harbor, Manhattan, New York..Part Of: Robert Yarnall Richie pho... More

[Statue of Liberty and Lighted Brooklyn Bridge]

[Statue of Liberty and Lighted Brooklyn Bridge]

Title: [Statue of Liberty and Lighted Brooklyn Bridge]..Creator: Robert Yarnall Richie, 1908-1984..Date: November 9, 1965..Place: New York Harbor, Manhattan, New York..Part Of: Robert Yarnall Richie photograph ... More

[Statue of Liberty at Sunset]

[Statue of Liberty at Sunset]

Title: [Statue of Liberty at Sunset]..Creator: Robert Yarnall Richie, 1908-1984..Date: November 9, 1965..Place: New York Harbor, Manhattan, New York..Part Of: Robert Yarnall Richie photograph collection..Descri... More

View of Lower Manhattan from the Manhattan Bridge, September 11, 2001
Leaf from a Beatus Manuscript: at the Clarion of the Fifth Angel's Trumpet, a Star Falls from the Sky; the Bottomless Pit is Opened with a Key; Emerging from the Smoke, Locusts Come Upon the Earth and Torment the Deathless
Jupiter deprives Lara of her tongue, Naiads, Juturna(?), Juno(?); the cosmos (world) divided in sky (ether and air) and earth (water and land); souls; God at the beginning of the creation: division of sea and earth; creation of birds; creation of fishes; creation of beasts
of the field (background)
Saturn in the sky presiding the works of agriculture
Ritual Cache
Janus on his throne (the celestial god or sky) and Tellus (terrestrial goddess or earth) between animals
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