What is "dark star"

Dark Star or Darkstar may refer to:

Dark Star is a 1974 American comic science fiction film directed, co-written, produced and scored by John Carpenter, and co-written by, edited by and starring Dan O'Bannon.

A dark star is a theoretical object compatible with Newtonian mechanics that, due to its large mass, has a surface escape velocity that equals or exceeds the speed of light. Whether light is affected by gravity under Newtonian mechanics is questionable but if it were accelerated the same way as projectiles, any light emitted at the surface of a dark star would be trapped by the star's gravity, rendering it dark, hence the name.

Dark Star (April 4, 1950 - October 21, 1972) was an American thoroughbred racehorse and sire. During his racing career he won six races, most notably the 1953 Kentucky Derby, in which he defeated Native Dancer.

Dark Star were an English psychedelia rock band, formed in 1996 in London. The band comprised vocalist/guitarist Christian Hayes, drummer David Francolini and bassist Laurence O'Keefe

"Dark Star" is a song released as a single by the Grateful Dead on Warner Bros. records in 1968. It was written by lyricist Robert Hunter and composed by lead guitarist Jerry Garcia; however, compositional credit is sometimes extended to include Phil Lesh, Bill Kreutzmann, Mickey Hart, Ron "Pigpen" McKernan, and Bob Weir. "Dark Star" was an early Grateful Dead classic and became one of their most loved and anticipated numbers, often with the group using it as a vehicle for musical improvisation sessions that extended beyond the original structure of the song. The song is included in The Rock and Roll Hall of Fame's 500 Songs that Shaped Rock and Roll list and was ranked at number 57 on Rolling Stone's 100 Greatest Guitar Songs of All Time. "Dark Star" was often the basis for jamming during the Dead's live shows, allowing the band to employ techniques typical of improvisational jazz.

A dark star is a type of star that may have existed early in the universe before conventional stars were able to form. The stars would be composed mostly of normal matter, like modern stars, but a high concentration of neutralino dark matter within them would generate heat via annihilation reactions between the dark-matter particles. This heat would prevent such stars from collapsing into the relatively compact sizes of modern stars and therefore prevent nuclear fusion among the normal matter atoms from being initiated.

Under this model, a dark star is predicted to be an enormous cloud of hydrogen and helium ranging between 4 and 2000 astronomical units in diameter and with a surface temperature low enough that the emitted radiation would be invisible to the naked eye.

In the unlikely event that dark stars have endured to the modern era, they could be detectable by their emissions of gamma rays, neutrinos, and antimatter and would be associated with clouds of cold molecular hydrogen gas that normally wouldn’t harbor such energetic particles.

Dark Star is a live album by the rock group the Grateful Dead. It was recorded on May 4, 1972, at the Olympia Theatre in Paris, France. It contains only one song from that concert — a version of " Dark Star" that, including an embedded drum solo, is almost 40 minutes long. It was produced as a vinyl LP in a limited edition of 4,200 copies, and released on April 21, 2012, in conjunction with Record Store Day.

The entire May 4, 1972 concert, like all of the shows from the Dead's 1972 tour of Europe, was released on CD in 2011, both as a separate album and as part of the boxed set Europe '72: The Complete Recordings.