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British Prime Minister Theresa May tweeted: \"His legacy will not be forgotten.\"

\"Professor Stephen Hawking was a brilliant and extraordinary mind - one of the great scientists of his generation. His courage, humour and determination to get the most from life was an inspiration. His legacy will not be forgotten.\" — PM

— UK Prime Minister (@10DowningStreet) March 14, 2018

NASA tweeted: \"May you keep flying like superman in microgravity.\"

In 2007, Hawking became the first quadriplegic to experience weightlessness and has said his \"ultimate ambition\" was to go to space aboard a commercial suborbital spaceflight. Richard Branson's company Virgin Galactic once even promised Hawking a trip to space, and Hawking said he accepted immediately.

Remembering Stephen Hawking, a renowned physicist and ambassador of science. His theories unlocked a universe of possibilities that we & the world are exploring. May you keep flying like superman in microgravity, as you said to astronauts on @Space_Station in 2014 pic.twitter.com/FeR4fd2zZ5

— NASA (@NASA) March 14, 2018

Fellow scientists also paid tribute to the star of his generation, including U.S. astrophysicist Neil deGrasse Tyson and artificial intelligence researcher Demis Hassabis.

His passing has left an intellectual vacuum in his wake. But it's not empty. Think of it as a kind of vacuum energy permeating the fabric of spacetime that defies measure. Stephen Hawking, RIP 1942-2018. pic.twitter.com/nAanMySqkt

— Neil deGrasse Tyson (@neiltyson) March 14, 2018

The world has lost a beautiful mind and an extraordinary human being. Such a privilege to have once had the chance to talk to Stephen about AI. RIP Stephen Hawking pic.twitter.com/w4SPl4RLsX

— Demis Hassabis (@demishassabis) March 14, 2018

Even the Pontifical Academy of Sciences paid its respects, tweeting a picture of Hawking and Pope Francis.

We are deeply saddened about the passing of our remarkable Academician Stephen #Hawking who was so faithful to our Academy. He told the 4 Popes he met that he wanted to advance the relationship between Faith and Scientific Reason. We pray the Lord to welcome him in his Glory https://t.co/iZyWrFaLnr

— Casina Pio IV (@CasinaPioIV) March 14, 2018

Google CEO Sundar Pichai weighed in, too.

The world has lost a beautiful mind and a brilliant scientist. RIP Stephen Hawking

— Sundar Pichai (@sundarpichai) March 14, 2018

And world leaders, including Indian Prime Minister Narendra Modi, took to Twitter to celebrate Hawking.

Professor Stephen Hawking was an outstanding scientist and academic. His grit and tenacity inspired people all over the world. His demise is anguishing. Professor Hawking’s pioneering work made our world a better place. May his soul rest in peace.

— Narendra Modi (@narendramodi) March 14, 2018

Film director Errol Morris, who directed a documentary on the physicist, wrote: \"We were lucky to have him for so long.\"

It had to happen, eventually. We were lucky to have him for so long, and I was lucky to be able to work with him. A truly fabulous human being. Stephen Hawking. Funny, perverse, and, of course, brilliant.

— errolmorris (@errolmorris) March 14, 2018

Stars who paid tribute to Hawking on Twitter include Steven Tyler, Sharon Stone and Katy Perry.

there’s a big black hole in my heart hours before Pi day. Rest In Peace @Steven_Hawking... See you in the next ??

— KATY PERRY (@katyperry) March 14, 2018

Rest In Peace Stephen Hawking. ?? pic.twitter.com/QxvrltnDJq

— Sharon Stone (@sharonstone) March 14, 2018

Wow. Stephen Hawking. Nothing but respect. R.I.P.

— Boy George (@BoyGeorge) March 14, 2018

YOU KNEW THIS UNIVERSE BETTER THAN THE REST OF US...AND NOW YOU PLAY IN SOME FAR AWAY PART OF IT. YOU CHANGED THE WORLD AND LEFT AN IMPACT...A REMARKABLE GENIUS WE WONT SOON FORGET. ENDLESS THANK YOUS AND BLESSINGS TO THE HAWKING FAMILY. GOD BLESS STEPHEN HAWKING. pic.twitter.com/UxnNknbMaB

— Steven Tyler (@IamStevenT) March 14, 2018

RIP STEPHEN HAWKING I'm gonna cry

— Jaden Smith (@officialjaden) March 14, 2018

\"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge\"
RIP Stephen Hawking

— Courtney Love Cobain (@Courtney) March 14, 2018

He lives . Forever our most beautiful mind & hero . Long live #StephenHawking https://t.co/MtvkJfyCXT

— Janelle Monáe, Cindi (@JanelleMonae) March 14, 2018

Cheers to you Stephen Hawking, the greatest mental athlete of our time. You are all that is! See you around, buddy! ;^) pic.twitter.com/LEqYnFn2rW

— Jim Carrey (@JimCarrey) March 14, 2018
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