Sky Uno (English: Sky One) is an Italian entertainment television channel, based on the defunct reality television channel SKY Vivo, both owned and broadcast by Sky Italia.

During the night it broadcasts the Late Show with David Letterman, which was previously aired on RaiSat Extra. The program is replayed twice the day after.

The channel broadcasts in high-definition from 20 October 2011.

The sky, also known as the celestial dome, commonly refers to everything that lies a certain distance above the surface of Earth, including the atmosphere and the rest of outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an imaginary dome where the sun, stars, planets, and the moon are seen to be traveling. The celestial sphere is divided into regions called constellations. Usually, the term sky is used from the point of view of the Earth's surface. However, the exact meaning of the term can vary; in some cases, the sky is defined as only the denser portions of the atmosphere, for example.

During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. During the day, the Sun can be seen in the sky, unless obscured by clouds. In the night sky (and to some extent during the day) the moon, planets and stars are visible in the sky. Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation can also be seen in the sky during storms. Birds, insects, aircraft, and kites are often considered to fly in the sky. As a result of human activities, smog during the day and light pollution during the night are often seen above large cities.

Uno may refer to:

Alessia Marcuzzi (born November 11, 1972) is an Italian television host and actress.

Born in Rome, she has debuted in Telemontecarlo hosting Attenti al dettaglio and then Qui si gioca, with Josè Altafini, in the 1991/1992 season. In March 1992 also presented the kids show Amici mostri. In the 1992/1993 season hosted the intertainment sho Novantatrè, with Umberto Smaila. Has appeared in RAI televisions in 1994, with Gigi Sabani, in Il grande gioco dell'oca. In 1994 also debuted as actress in the movies Chicken Park, directed by Jerry Calà, and Tra noi due è tutto finito.

She started working in Mediaset from November 1995 hosting the Italia 1 Saturday afternoon program Colpo di fulmine, until June 1997. It became a daily show in 1996, because of his great success. Thanks to this program has become one of the most important Italia 1 host; in this period she started hosting the well-known music festival Festivalbar, from 1996 to 2002, with whom she won a Telegatto in 2001, has presented the late night show 8 millimetri with Paolo Brosio and, from 1997 to 1998, the afternoon show Fuego!. She also presented the primetime show Mai dire Gol, from 1998 to 2000, with Ellen Hidding and the Gialappa's Band. In these years acted in the movies Gunslinger's Revenge, directed by Giovanni Veronesi, Tutti gli uomini del deficiente, and the TV movie Un cane e un poliziotto and the series Tequila & Bonetti, acting with Jack Scalia. In 2000 hosted the pilot of Macchemù, with Paola Barale, dedicated to television themes and won the Oscar TV as "Personaggio televisivo femminile dell'anno".

Alessandra Amoroso (born 12 August 1986 in Galatina, Lecce) is an Italian pop/soul singer. She was the winner of the 2009 edition of the Italian talent show Amici di Maria De Filippi.

Since her youth, Amoroso participated in numerous local competitions, obtaining good results. In June 2007 she participated in a contest, Fiori di Pesco, singing the song Amor mio, and placed first among the competitors, and was rewarded by Mogol. When she was seventeen, she participated in the auditions for Amici but she failed.

On October 5, 2008, Amoroso passed the audition for the eighth season of Amici di Maria De Filippi, singing the single from Alicia Keys, "If I Ain't Got You". Rudy Zerbi, the chairman of Sony Music Italy, assigned three unpublished singles to Amoroso. She participated in the recording of the compilation disc of the programme, Scialla. "Find a Way" reached the fourth place in the charts, while "Immobile" reached the top position. During the program, the singer distinguished herself thanks to her voice: all the teachers, especially Luca Jurman, recognized a sandblasted timbre. On 25 March 2009, Amoroso was proclaimed winner of Amici di Maria De Filippi, winning the first prize of 200,000 euros. On the same evening, she also received the critics' prize, a scholarship worth 50,000 euros. With this money, Amoroso says she will continue to study with voice teacher Luca Jurman.