Celebrities have been positing tributes on Twitter to actor Leondard Nimoy.
Live long and prosper. So long, Mr. Nimoy.
Leonard Nimoy dying seems somehow...illogical.
Leonard Nimoy brought us one of the greatest, noblest characters in the history of American storytelling. Someone find the Genesis planet.
Truly sad hearing the passing of Mr Leonard Nimoy. A wonderful humanitarian and poet. The needs of the many, outweigh the needs of the few.
George Takei, known for his role as Hikaru Sulu in the television series Star Trek, said he will miss Leonard Nimoy and the world had "lost a great man"
On his official Facebook page Mr Takei said Nimoy was being "returned to the stars".
He also told MSNBC: "You know, the word ‘extraordinary’ is often overused, but I think it’s really appropriate for Leonard.
"He was an extraordinarily talented man, but also a very decent human being. His talent embraced directing as well as acting, and photography.
"He was a very sensitive man and we feel his passing very much. He’d been ill for a long, long time and we miss him very much.”
William Shatner, who played Star Trek's Captain Kirk, said he loved Leonard Nimoy "like a brother".
He added: "We will all miss his humour, his talent, and his capacity to love."
Leonard Nimoy's granddaughter Dani has posted a moving tribute to the 83-year-old actor through his official Twitter account.
She said her grandfather was "an extraordinary man, husband, grandfather, brother, actor, author-the list goes on- and friend. Thank you for the warm condolences. May you all LLAP (Live Long And Prosper)".
Nasa has paid tribute on Twitter to Star Trek star Leonard Nimoy who has died at the age of 83.
Leonard Nimoy's son, Adam, confirmed the actor died Friday morning in Los Angeles of end-stage chronic obstructive pulmonary disease.
Although an accomplished acting teacher, director, poet and photographer Nimoy, who was in 'Star Trek from 1965 to 1969, will always be known in the public's mind as Mr Spock.
His half-human, half-Vulcan character was the calm counterpoint to William Shatner's Captain Kirk on one of television and film's most revered cult series.
The actor was catapulted to fame by the series, and became a household name for Star Trek fans across the world.
But his ambivalence towards the role was clear - his two autobiographies were titled I Am Not Spock (1975) and I Am Spock (1995).
In 1954 Nimoy married Sandra Zober, a fellow student at the Pasadena Playhouse, and they had two children, Julie and Adam.
But the couple divorced, and in 1988 he married Susan Bay, a film production executive.
Actor Leonard Nimoy, best known for his role as Mr Spock on the long-running science fiction series Star Trek, has died at the age of 83.
His wife, Susan Bay Nimoy, confirmed his death, saying the cause was end-stage chronic obstructive pulmonary disease.
On February 23 Mr Nimoy's official Twitter account posted a poignant message about life and memories which ended with his motto LLAP - or Live Long And Prosper.
A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP
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