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   at      at      for      for      for      for      for      from      from      from      in      in      in      of      of      of      on      over      up  
Time travelers have been invited to attend the memorial service Professor Stephen Hawking. The legendary physicist, cosmologist and author died March 14. Thousands fans and well-wishers lined the streets Cambridge, England his funeral two weeks later. His family has now arranged a special ceremony to allow people to remember and celebrate his life, and time travelers have been invited. Hawking famously wrote his book "A Brief History of Time" that: "If time travel is possible, where are the tourists the future?" Now they have the opportunity to travel back time. The online entry form the memorial allows people with birth dates to December 31, 2038 to take part.

The concept time travel had fascinated and intrigued Professor Hawking the decades. In 2009, he staged a glitzy party time travelers Cambridge University. He arranged champagne and snacks, and a banner saying: "Welcome time travelers". No one the future attended that particular event. A spokesman the Stephen Hawking Foundation, which is organizing the memorial service, said he had yet to receive a response any time travelers to attend the memorial service. The deadline to reserve a place the June 15 event at London's Westminster Abbey is today. The spokesman said it was still possible. He said: "We cannot exclude the possibility time travel as it has not been disproven to our satisfaction."

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