If youre feeling all dreamy about the universe, heres a pro tip: dont tell Brian Greene. That guy can chill your cosmic buzz fast. I recently swung by the office of the Columbia University theoretical physicist full of happy, giddy questions and came away pretty much empty. Is there such a thing as a natural moral order? I wondered. Not in this universe, there isnt. What about a purpose to the universe, thenthe reason the whole 13.8 billion-year-old shebang with its hundreds of billions of galaxies and trillions of planets happened in the first place? Nope, Greene says, no such purpose, adding, And thats O.K. Maybe for him it is.

Surely, though, Greene will grant the existence of free willthat first item on the wish list of every freshman-year philosophy student who ever lived. Sorry, not a chance.

Your particles are just obeying their quantum-mechanical marching orders, Greene says. You have no ability to intercede in that quantum-mechanical unfolding. None whatsoever.

But heres the thing about Greene, founder of the World Science Festival; host of multiple TV series on PBS; and the author of five books, including the blockbuster The Elegant Universe and the just-released Until the End of Time: he says it all with such ebullience, such ingenuous enthusiasm, that if he told you the whole cold, amoral universe was ending tomorrow youd roll with it the way he wouldas just one more dramatic chapter in an extraordinary tale in which we all have a precious if fleeting role. Thats not to say everyone embraces his cosmic view so easily.

Ill be frank, Greene says. I have some students come in crying. And they say, This is kind of shaking my world up, and I say to them, Thats not a bad thing. Its fine to have your world shook. The pieces may fall back in the end to where you were, and they may not.'

On the day I saw him, the man who has made himself the master of some of the most abstruse aspects of physicssuperstring theory, spatial topographywas instead being mastered by one of the more basic ones: gravity. He was struggling about on crutches, the result of two ruptured spinal disks, which can give out over time whether or not youre the kind of person who can explain the attraction between the mass of the earth and the mass of your back.

When he makes his way from desk to couch, he drops down gratefully. Behind him is a whiteboard with a storm of equations written on it. The numbers and glyphs frame his face in a perfect metaphor for the impossibly complex ideas that play out in his head, then somehow emerge comprehensibly and coherently on the page.

Its a busy time for Greene. His World Science Festival will begin its 13th season in May in New York City and its fifth year in its satellite venue in Brisbane, Australia, in March. The Down Under version attracted a total of 700,000 visitors in its first four years. The New York edition has drawn a cumulative 2 million people and more than 40 million online views of its content.

Greene, 57, is also preparing for a promotional tour for his new book, and keeps up a full schedule of teaching, holding office hours and advising graduate students. During our conversation, he mentioned that he was booked to give an evening talk on superstring theory to a gathering of the universitys Society of Physics Students. Its a Friday night, a party night, but for the students and Greene, talking superstrings is a party.

Ive found that the theoretical physicists Ive spent the most time with are the ones who are just enthralled by the ideas and the minutiae of an equation working out, he says. The only difference I have seen relative to my colleagues is Ive never found pure research to be enough. Ive always felt like the world is so big and rich that I need to engage with it in different ways. And that can be the books, it can be the TV shows.

Greene comes by his love of performance rightly. His father was a vaudeville entertainer as well as a composer and voice coach. But Greenes own passion was math and science and then big sciencethe kind that seduces you with questions that both demand and defy answers, that can cross the line from science to something else entirely. Here, too, a close family member helped.

My brother is a Hare Krishna devotee, Greene says. Hes 13 years older than I am. When I was little and getting interested in math and physics, hed say, What are you learning? Id describe the Big Bang, and hed pull out the Vedas and read to me from them. It was a very interesting back-and-forth over the decades between the scientific pathway toward a certain kind of truth and the spiritual, religious pathway to a certain kind of truth.

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That tension plays out elegantly in Greenes new book, and to make sure no one misses the dialectic, the chapter names make it clear: Duration and Impermanence, Origins and Entropy, Particles and Consciousness. Greene takes one of his most powerful whacks at entropy, attacking the nettlesome business of the second law of thermodynamicsthe broad truth that all systems tend to disorder, which is often used to challenge the truth of evolution itself: that profoundly complex order can emerge from the chaos.

I resolve that tension in Chapter 3, Greene says, a boast that could pass as arrogant except that, well, he does resolve the tension in Chapter 3. It relies on the force of gravity. Without gravity, everything just spreads out, diffuses, and thats all there would be. But gravity has this wonderful capacity as a universally inward-pulling force which can undertake the following magic trick: it can pull things together, making it more orderly here, at the expense of releasing heat that makes it more disorderly out there. I call it the entropic two-step.'

Theres a lot of satisfaction in such neat solutions to head-cracking problems. But there is an equivalent neatness to the ostensibly dispiriting conclusions Greene reaches in his books and in his research: that unhappy business of a cold universe, an insentient universe, of the individual as just a quantum contraption, behaving as a product not of choice but of probabilities and randomness. Its where the free-will thing comes in: the universe is guided by quantum probabilities, and your choices are simply a part of that, the way a local breeze is part of the global weather system.

My feeling is that the reductionist, materialist, physicalist approach to the world is the right one, Greene says. There isnt anything else; these grand mysteries will evaporate over time. But despite such empirical bravado, Greene says more tooand whether he likes it or not, its not reductionist, and if its written in a book like Until the End of Time, it could be written in the Vedas as well.

Rather than feeling, Damn, theres no universal morality, Damn, theres no universal consciousness,' he says, how wondrous is it that I am able to have this conscious experience and its nothing more than stuff? That stuff can produce Beethovens Ninth Symphony, that stuff can produce the Mona Lisa, that stuff can produce Romeo and Juliet? Holy smokes, thats wondrous. The rational physicist with the deeply spiritual brother surely meant the holy as just a figure of speechbut if so, he picked an apt one.

This appears in the March 02, 2020 issue of TIME.

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Write to Jeffrey Kluger at jeffrey.kluger@time.com.

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