( CNN ) Since Friday , social media debates such as # thedress were silenced . There was more sobering news . Leonard Nimoy , `` Star Trek 's '' beloved Mr. Spock , had died . His co-stars , fellow celebrities and fans reacted with heartfelt tributes from around the world and all the way to space , where astronaut Terry W. Wirts flashed a Vulcan salute aboard the International Space Station . As the weekend went on , billboards from the company Outfront Media ( formerly CBS , owners of `` Star Trek '' ) showed up around Atlanta . Longtime friend and co-star William Shatner remembered Nimoy `` like a brother . '' George Takei wrote , `` Today , the world lost a great man , and I lost a great friend . We return you now to the stars , Leonard . '' And Zachary Quinto , who played Spock in the recent `` Star Trek '' movie reboots , said , `` my heart is broken . '' The hashtag # LLAP , which stands for `` Live long and prosper '' and which Nimoy used to sign his tweets , was trending across several social media platforms after the news of his death . The outpouring on Twitter and elsewhere left no doubt about Nimoy 's indelible mark on pop culture . Nimoy 's career also inspired some of the most brilliant minds in space and science . NASA posted a 1979 photo of Nimoy and the `` Star Trek '' cast -- some sporting '70s leisure suits -- visiting the space shuttle Enterprise . And then there were the ordinary fans -- Trekkies , aspiring actors and science geeks who related to Nimoy 's brainy Spock character -- who posted personal messages and remembrances . Nimoy in 2010 : `` I feel very fulfilled '' with my work . Paul Roth , 39 , chief information officer at Chesapeake Systems in Baltimore , posted a teary-eyed photo using the # LLAP hashtag . `` Leonard Nimoy showed a young , nerdy , bullied me that not only could science be important and valued , but it could literally save entire ships , planets , and galaxies of lives , '' he said . `` As I grew up , he taught me that reason could be tempered with humor . That learned adults still had more to learn . That feminism and opposing prejudice was vital . And that there is no age too late to reinvent yourself . '' Neil Macdonald from Widnes in the United Kingdom wrote on Instagram : `` I have been and always shall be your friend . '' And , Molly Desormeaux , an acting student in Montreal , Quebec , said : `` Leonard Nemoy is one of the reasons why I still believe that acting can change peoples ' lives . '' Nimoy : `` Fringe '' cast impressed me the most . We 'll give Nimoy himself the last word . The actor , filmmaker and author , who was an active user of Twitter up until his death , shared a final thought Monday that exemplifies the fleetingness and beauty of life . CNN 's Daphne Sashin and Christina Zdanowicz contributed to this story .
Co ’ founders , science enthusiasts and fans pay tribute to ` ` ` Trek 's '' Leonard Nimoy . com , best known for his role as Mr. Spock , died suddenly at 83 .