The triple system, called HR 6819, is perhaps three times closer than the previous closest-known black hole.
Astronomers across the globe will hold "six major press conferences" simultaneously on Wednesday to announce the first results of the Event Horizon Telescope (EHT).
The scientist and author of "A Brief History of Time," died in March aged 76 and his ashes were interred between major British scientific figures Isaac Newton and Charles Darwin in London's Westminster Abbey.
Members of the public have been invited to apply for tickets to attend a celebration of Hawking's life at a memorial service in Westminster Abbey on June 15, even if they haven't been born yet.
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