Star

A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations.

For at least a portion of its life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. Once the hydrogen in the core of a star is nearly exhausted, almost all naturally occurring elements heavier than helium are created by stellar nucleosynthesis during the star's lifetime and, for some stars, by supernova nucleosynthesis when it explodes. Near the end of its life, a star can also contain degenerate matter. Astronomers can determine the mass, age, metallicity (chemical composition), and many other properties of a star by observing its motion through space, luminosity, and spectrum respectively. The total mass of a star is the principal determinant of its evolution and eventual fate. Other characteristics of a star, including diameter and temperature, change over its life, while the star's environment affects its rotation and movement. A plot of the temperature of many stars against their luminosities, known as a Hertzsprung–Russell diagram (H–R diagram), allows the age and evolutionary state of a star to be determined.

Dance

Dance is a performance art form consisting of purposefully selected sequences of human movement. This movement has aesthetic and symbolic value, and is acknowledged as dance by performers and observers within a particular culture. Dance can be categorized and described by its choreography, by its repertoire of movements, or by its historical period or place of origin.

An important distinction is to be drawn between the contexts of theatrical and participatory dance, although these two categories are not always completely separate; both may have special functions, whether social, ceremonial, competitive, erotic, martial, or sacred/liturgical. Others disciplines of human movement are sometimes said to have a dance-like quality, including martial arts, gymnastics, figure skating, synchronized swimming and many other forms of athletics.

Performance and participation

Theatrical dance, also called performance or concert dance, is intended primarily as a spectacle, usually a performance upon a stage by virtuoso dancers. It often tells a story, perhaps using mime, costume and scenery, or else it may simply interpret the musical accompaniment, which is often specially composed. Examples are western ballet and modern dance, Classical Indian dance and Chinese and Japanese song and dance dramas. Most classical forms are centred upon dance alone, but performance dance may also appear in opera and other forms of musical theatre.

Selena Gomez

Selena Marie Gomez (/səˈliːnə məˈriː ˈɡoʊmɛz/ sə-LEE-nə mə-REE GOH-mez;Spanish pronunciation: [seˈlena ˈɣomes]; born July 22, 1992) is an American singer and actress. Born and raised in Grand Prairie, Texas, she was first featured on the children's series Barney & Friends in the early 2000s. In 2007, Gomez came to prominence after being cast in the Disney Channel series Wizards of Waverly Place, in which she starred as the lead character, Alex Russo, until its conclusion in 2012. She formed the band Selena Gomez & the Scene after signing a recording contract with Hollywood Records in 2008; they released the studio albums Kiss & Tell (2009), A Year Without Rain (2010), and When the Sun Goes Down (2011) before beginning a hiatus in 2012.

Gomez entered the film industry with star billings in feature films including Ramona and Beezus (2010), Monte Carlo (2011), and Hotel Transylvania (2012). She embraced an increasingly mature public image with her star billing in the film Spring Breakers (2013) and her 2013 debut solo studio album, Stars Dance. The latter project debuted at number one on the US Billboard 200 and included the Billboard Hot 100 top-ten single "Come & Get It." Gomez was released from her recording contract with Hollywood Records following the completion of her compilation album For You (2014). She subsequently signed with Interscope Records to continue work on her sophomore studio album, Revival (2015). It debuted at number one in the US and featured the top-five singles "Good for You" and "Same Old Love" and the top-ten single "Hands to Myself."