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    It's perhaps not surprising that Stephen Hawking, the world's most famous theoretical physicist, would have a special affinity for the Hubble Space Telescope. After all, both he and the 25-year-old satellite are trailblazers:    1          With the help of a retrofit, the Hubble managed to overcome a flaw in its mirror to produce a vast array of groundbreaking observations. For Hawking, the struggle was even more daunting.     2     . For decades he has needed a wheelchair to get around and a computer synthesizer to speak. Even so, Hawking has explored the universe with his intellect. 

    In the 1970s, Hawking — who held a professorship at Cambridge University that once was filled by Isaac Newton — developed a set of laws governing the behavior of black holes that mirrors the conventional laws of thermodynamics. He also showed that, contrary to physicists' prior belief that nothing could escape from a black hole, these bodies actually should be able to emit heat. Hawking also was one of the first to show how quantum fluctuations — that is, tiny variations in how matter is distributed — played a role in the expansion of galaxies.     3     .

     According to a profile in Astronomy magazine, Hawking, who continues to conduct research and write with the help of a team of assistants, recently added a new tool to assist his work — a telescope connected to his home's Wi-Fi network, which he can manipulate using a cheek-controlled switch. 

         4     . As Space.com reported in 2014, NASA scientists have used Hubble and other orbital observatories to test some of Hawking's theoretical work. 

    Just as Hubble's dramatic images have fascinated the public, Hawking — author of a dozen books aimed at lay audiences — has helped introduce people to the wonders of the cosmos. His most famous work, the 1988 bestseller A Brief History of Time, has sold more than 10 million copies and has been translated into 40 languages.     5     . Hawking described Hubble's discovery that the universe is expanding as "one of the great intellectual revolutions of the 20th century."

 
(A) Hawking's work has dovetailed with Hubble's observations of the universe.

 
(B) In that book, Hawking paid tribute to Edwin Hubble, the American astronomer for whom the telescope is named. 

(C) They've made enormously important scientific breakthroughs while struggling against adversity. 

(D) He's spent much of his time since then trying to develop a theory for explaining gravity in the context of quantum physics. 

(E) One of the world's great minds found himself in a body ravaged by a form of the neurological disease amyotrophic lateral sclerosis