He died peacefully at his home in Cambridge
in the early hours of Wednesday, his family
said.
The Briton was known for his work with black
holes and relativity, and wrote several popular
science books including A Brief History of
Time.
At the age of 22 Prof Hawking was given only
a few years to live after being diagnosed
with a rare form of motor neurone disease.
In a statement his children, Lucy, Robert
and Tim, said: "We are deeply saddened that
our beloved father passed away today.
"He was a great scientist and an extraordinary
man whose work and legacy will live on for
many years."
They praised his "courage and persistence"
and said his "brilliance and humour" inspired
people across the world.
"He once said, 'It would not be much of a
universe if it wasn't home to the people you
love.' We will miss him forever."
A book of condolence is due to be opened at
Conville and Caius College in Cambridge, where
Prof Hawking was a fellow.
