Hawking, who died last year, was a theoretical physicist, cosmologist and author who, before his death, was director of research at the Center for Theoretical Cosmology at the University of Cambridge. His scholarly work has included a collaboration with Roger Penrose on gravity theorems for singularity within general relativity, and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Hawking was the first to expose the theory of cosmology, explained by the unification of general theory of relativity and quantum mechanics.
In 2010, Hawking wrote his own Discovery Channel series, "In the Universe with Stephen Hawking," where
during the program, he tried to explain to viewers how a black hole is formed in space.
He said: "It is difficult to imagine how dense the black hole will be, but I will try to put it in perspective using something familiar ̵
"Imagine, in part, I could compress our planet until gravity took over and it became a black hole.
Stephen Hawking made an unexpected discovery
My most unexpected discovery is that a black hole can't be perfectly black
"How small would it be to make it disappear a gravity hole? "
" From 8,000 miles in diameter, I'd have to break it to a and the pea. "
Hawking admitted that there is one thing that startled him over cosmic phenomenon.
He added: "In my years of studying black holes, my most unexpected discovery is that a black hole cannot be perfectly black.
"For the same reason that the early universe cannot be perfectly unfolded, there is no such thing as perfection.  READ MORE: Stephen Hawking's Proposal for a "Black Hole Time Machine" at NASA
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"Black holes must emit radiation, the smaller the black k hole, the greater the radiation.
"But in fact, only a tiny black hole shines with the mass of a mountain range.
"In space, most black holes are much larger. "
Hawking went on to explain how there were several types of black holes in space.
He went on: "The smaller ones are about four times the mass of our Sun and are 15 miles in diameter.
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Hawking theorizes using a black hole as a time machine
"Some are much larger, containing the mass of thousands of suns.
"And then there are the really big, supermassive black holes, they exist in the center of galaxies like ours "
[1 9459006]" This black hole is thought to have a mass of four million suns and a diameter of 11 million miles.
"Black holes like these are heavy the hearts that galaxies, including our own Milky Way, turn to. "
In episode 2, Hawking revealed how NASA could one day use a black hole to travel in time.
Stephen Hawking is a professor at Cambridge
He says, "I like to imagine how one day a spacecraft will be able to benefit from this spectacular phenomenon.
"Of course, the suction should be avoided first, the trick I think would be to steer it right sideways so it doesn't miss.
They would have to be on the right trajectory and speed or would never run away.
"Correct it properly and the ship will be pulled into orbit, a giant 30 million-mile circle
" It would be safe here, its speed would be sufficient,
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Hawking continued, explaining how time could be cut in half by following his theory.
He added: "If a space agency controlled the mission from Earth or anywhere far from the black hole, they would observe that each full orbit would take 60 minutes.
But for the courageous people on board near this massive object, time will slow down and here the effect will be far more extreme than near planet Earth.
"The cruise time will be delayed by half.
"For each 16-minute orbit, they only survive eight minutes.
"Circle and circle will go, experiencing only half the time of all away from the black hole. ”