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Crush: Close Encounters with Gravity

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The fascinating story of gravity, from its intimate role in our daily lives to its cosmic significance.


Gravity is at once familiar and mysterious. It’s the reason for the numbers on your bathroom scale, the intricate dance of the stars and planets, and the evolution and eventual fate of the universe. In Crush, James Riordon takes readers on a tour of gravity from its vanishing insignificance on the microscopic scale to its crushing extreme inside black holes.

From the moment we lift our heads as infants until the moment we lie down and ultimately surrender to its pull at the end of our lives, we labor under the burden of gravity. It has guided the shape and structure of our bodies over eons of evolution and sculpted the Earth as it cooled from a blob of molten rock. As Riordon explains, the stars couldn’t shine without gravity holding them together. Even the atoms that make up you and everything around you were forged in stellar furnaces that gravity built. It took Einstein to realize that gravity is not, in fact, a force at all, but instead the curvature of space and time.

A fascinating and memorable read, Crush examines our personal relationships with gravity; explores gravity’s role in making the universe uniquely hospitable for life; and even reveals how the mundane flow of water in your kitchen sink offers a glimpse into the secrets of black holes.

240 pages, Hardcover

Published November 18, 2025

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James Riordon

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Displaying 1 - 8 of 8 reviews
Profile Image for Jung.
1,957 reviews45 followers
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January 8, 2026
James Riordon’s "Crush: Close Encounters with Gravity" takes readers on a captivating journey through one of the most pervasive yet mysterious forces in the universe. Gravity shapes our every movement, frames the behavior of planets and galaxies, and even influences life at its most intimate level, yet it remains remarkably elusive in our understanding. Riordon traces the story of gravity from its observable effects in daily life to the farthest reaches of cosmic phenomena, blending physics, history, and speculation in a narrative that reminds us just how central and yet enigmatic this force is.

From the first moments of freefall to the profound pull of distant stars, gravity is intertwined with human experience. The sensation of fear when standing at the edge of a precipice, or the thrill of a rollercoaster plunge, highlights our instinctive awareness of this force. Early experiments, like the mid-20th-century 'visual cliff' tests with infants and animals, showed that responses to height are a mixture of innate reaction and learned experience, demonstrating that gravity’s influence is as psychological as it is physical. On Earth, the constant pull of 9.8 meters per second squared maintains our bone density, muscle health, and overall bodily function, while astronauts in orbit experience the effects of near-continuous freefall, revealing the body’s dependence on gravity through blood shifts, muscle wasting, and bone loss. Attempts to counteract these challenges with exercise equipment, vacuum devices, or tethered systems illustrate both human ingenuity and the difficulty of replicating our planet’s natural pull. Riordon even ventures into speculative futures, imagining ways humanity might preserve life on Earth as the Sun swells into a red giant, with gravity itself becoming a tool for planetary survival in a 'Spaceship Earth' scenario.

Gravity’s role extends beyond human experience to planetary habitability. Riordon explores the Goldilocks principle, showing that a planet must not only orbit within a suitable range of its star but also possess sufficient mass to retain an atmosphere and sustain liquid water. The presence of a magnetic field, generated by a convecting metallic core, shields planets from dangerous charged particles. Too much mass, however, leads to gas giants, brown dwarfs, or super-Earths with dense atmospheres ill-suited for life. Ideal worlds strike a balance: slightly larger than Earth to maintain strong magnetic protection yet not so massive as to lose surface chemistry and mobility. The book speculates on potential distant refuges like a hypothetical Planet 9 in the Kuiper Belt, whose gravity and internal heat might someday make it a viable habitat despite extreme cold and remoteness.

To grasp why some planets cradle life while others do not, Riordon revisits the foundational theories of gravity. Newton’s laws, asserting that objects with mass attract one another proportionally to their weight and inversely to distance, provided a straightforward framework for centuries. The concept of fields later refined this understanding, mapping gravitational influence in space. Einstein’s general relativity, however, revolutionized the picture, showing that gravity is not a force but the curvature of spacetime caused by massive objects. In this view, bodies move along geodesics, following the straightest paths through curved spacetime. Weight arises from the resistance experienced when the ground prevents this freefall. Riordon offers a vivid analogy of floating on an innertube through a flowing spacetime river, where Earth’s gravity is like the water moving beneath a stationary pier. Here, acceleration relative to space - not a mystical pull - is what we perceive as gravitational force. Even the gravitational constant, G, first measured in the 18th century, remains imprecisely known despite centuries of effort, illustrating that our understanding of gravity is both practical and profoundly incomplete.

Riordon extends the discussion to gravity’s extremes, where the familiar rules give way to bizarre phenomena. Black holes exemplify gravity at its most extreme: regions where matter and light cannot escape, culminating in a singularity where density becomes infinite in current models. Analogies like the hydraulic jump in a kitchen sink help conceptualize the event horizon and the rapid inward flow of spacetime. Approaching a black hole, one would witness dramatic light distortions, superheated infalling gas, and ultimately spaghettification, the stretching of matter into long strands. Beyond the visuals, gravitational waves - ripples in spacetime from massive bodies in motion - demonstrate gravity’s reach across billions of light-years. LIGO’s 2015 detection of waves from colliding black holes opened a new era of observational astronomy, offering insights into the universe’s most violent events and even the early moments following the Big Bang.

Yet, while general relativity excels on cosmic scales, it conflicts with quantum mechanics in extreme conditions, leaving the story of gravity incomplete. Riordon explores attempts at reconciliation, including string theory, which imagines fundamental particles as vibrating strings in multiple unseen dimensions, and loop quantum gravity, proposing that spacetime itself is composed of discrete loops, potentially preventing singularities through Planck-scale granularity. These theories offer frameworks for a cyclic universe or a 'big bounce,' yet remain untested or speculative, highlighting both the ambition and the uncertainty inherent in modern physics. The search for a unifying theory remains one of science’s greatest adventures, bridging the everyday experience of falling apples with the fate of galaxies and the origin of the universe itself.

Riordon emphasizes that gravity is simultaneously familiar and unfathomable. It shapes our bodies, sets the limits for planets capable of supporting life, creates black holes, guides the propagation of light and waves, and governs the motions of galaxies. Despite centuries of study, many questions remain unanswered, from the precise value of gravitational constants to the integration of gravity with quantum theory. The journey through "Crush" demonstrates how gravity connects the human scale to the cosmic, blending practical consequences, philosophical wonder, and scientific challenge. It is both the most intimate force we feel and the one whose depths continue to surprise, inspiring continued exploration and curiosity.

In conclusion, "Crush: Close Encounters with Gravity" by James Riordon illuminates gravity as the quiet architect of the universe. It governs everything from daily sensations of balance and motion to the survival of planets, the behavior of black holes, and the propagation of ripples across spacetime. Riordon shows that while gravity is deeply familiar, it is still filled with mysteries that drive physics, philosophy, and imagination alike. By weaving together history, theory, observation, and speculation, the book offers a comprehensive yet approachable account of a force that remains central to life, science, and the cosmos, leaving readers both awed and eager to continue exploring the unfinished story of gravity.
Profile Image for Janine.
1,670 reviews8 followers
November 14, 2025
What a fascinating and captivating book about gravity! I know very little if anything about gravity or other scientific principles, so when I came across this book, I thought maybe here is an opportunity to learn something! And, lucky for me NetGalley and the publisher, Tantor Publisher, gave the opportunity to listen to this ARC.

Science journalist, James Riordon, explores how gravity affects our daily life. Riordon explores how gravity affects small and large things. He explores black holes, probably the most interesting of the things I read - I may have watched too many Star Trek episodes - Riordon even includes an experiment you can do to replicate a black hole. But what is most clear is after listening to this book is that gravity is at the heart of our life. Everything on earth relies on gravity. Gravity is at the heart of the creation of our universe. I certainly learned a lot!

The book is exceptionally narrated. I felt the author was talking directly to me through Jon Vertullo.

Highly recommend.
Profile Image for Marl.
153 reviews4 followers
December 5, 2025
[4 stars]

Crush: Close Encounters With Gravity is a deep dive into how gravity works at its most extreme. I’ll admit right off the bat, I assumed that this would be more of what the early chapters of the book brought up - the more fun facts segments about whether or not fear of heights is instinctual or how gravity impacted the evolution of land versus water snakes as their hearts are in different positions (water snakes do not rear up like land snakes do) - and less of a layperson’s guide into relativity and quantum mechanics. Despite that, it was a very enjoyable book about a topic that I don’t think I would’ve picked up a book about any time soon, so I’m glad to have come across this one.

I was able to keep up with ~90% of this book despite me never ending up taking a physics class in high school or college, so it is definitely an accessible science book. Riordon includes numbers and formulas when necessary, but keeps from bogging the text down with numbers (this also helped the audiobook version - which I listened to - from having to speak out constant equations, though you do miss out on some pictures/diagrams with this format).

I really don’t have all that much to say about this one, especially with it being a topic that I knew next to nothing about going in. I think that Riordon accomplishes a good balance between the historical side of things - the timeline and order that different discoveries were made as well as what those scientists’ experiments were - and the purely scientific side of things. We look at both older and much more modern research and see how stark the differences in tools they use are. I also really liked the emphasis of how different gravity is compared to any force in the world. Gravity is waves that stretch on infinitely. If I jump, I have a (completely negligible) effect on planets beyond our solar system. That’s so hard to comprehend.

As with any science book, some parts were more interesting than others. The parts that I found slightly dull might be your favorite part. The only part that I was really lost on was one of the last chapters but I think that was more of me not knowing anything about the topic to begin with than anything against the book. I will say that I never found the book to be repetitive. Some topics/ideas naturally come up more than once, but he refrains from lingering on topics from past chapters.

A good book if you’re wanting to get a first look into just how important gravity is to just about everything in the universe as well as if you want to know what relativity actually is beyond sci-fi movies mentioning it sometimes. Just a pretty fun book.
Profile Image for Synthia Salomon.
1,229 reviews20 followers
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January 8, 2026
Blinkist app book of the day!
Crush (2025) pulls you into a world where everyday experiences – like watching water swirl in a sink – open doors to black holes, bending spacetime, and the strange physics that shape the universe.

From our fear of heights to the fate of the cosmos, it’s a fascinating look at gravity, the force we think we know best, but barely understand at all.
This entire review has been hidden because of spoilers.
Profile Image for Pauline Stout.
285 reviews8 followers
November 21, 2025
This is a book all about gravity. I picked up the audio version of this because I’ve been deep into books about physics lately and this sounded right up my alley. I enjoyed this but it didn’t wow me.

Parts of this were deeply fascinating and I was super into it. I especially liked the parts about black holes. But at the same time there were multiple sections that failed to hold my attention for some reason. I found myself having to rewind the audiobook at several points because I realized I just hadn’t absorbed what I had just listened to. I honestly don’t think it was a fault of the audiobook. This was well written and edited and easy to understand for the average person that doesn’t have a physics degree. I think this was a me thing and not a book thing. I think I might get more out of it if I read it again. Maybe I’ll have to set aside time do that in the future. (Perhaps with a physical copy instead of the audiobook.)

As I said I consumed this in audio version and I really liked it. The narrator did a lovely job with the book.

Overall I do have to say I recommend this. It was well put together and easy to understand. I can see a lot of people really liking this and I hope more people read it.
Profile Image for Brian Clegg.
Author 163 books3,180 followers
December 10, 2025
Sometimes when reading a book, just like being in any other relationship, you have to say ‘It’s not you, it’s me.’ Unfortunately, I really struggled to get on with James Riordon's eccentric take on gravity.

It's not that the main areas of the topic aren't covered. You'll find Newton and general relativity; black holes, white holes (and your kitchen sink), gravitational waves and dark matter/energy. But the approach to covering this includes surprisingly little science. Instead, Riordon skips around the topics, lacing the facts with personal observations (and even family details) touching on aspects of gravity without ever really telling us much of the scientific detail (I'm not sure if this should even be considered popular science.)

This is where the 'it's me' bit really kicks in. I like good narrative in a popular science book, though I feel there's far too much 'me' from the author in many such books of late. I read them to explore the science, not to discover family anecdotes and flit around the outskirts of the subject like intellectual moths around a streetlamp.

I'm sure there will be a big audience for whom Riordon's approach comes across as an entertaining, stimulating, informative read. But I don't know how many of them will be popular science readers. Each time a topic was introduced I thought 'now we'll get some meat', only to be disappointed. It's a bit like having a haut cuisine meal where you expect to find a lovely piece of venison under the delicious foam - only to discover that the foam is all there is to it.

Again, I'm sure it's me, but I find Riordon's jokey storytelling approach (like throwing in the kitchen sink mentioned above) just a bit too much. I can't deny there were parts I genuinely enjoyed - but often they were in little entertaining asides, which would be great if there was anything substantial for them to be aside to. So, for instance, I loved the fact that physicist William Press in 1980 calculated that humans should be no more than 2.6 centimetres tall. Or that in 2011, physicist Germain Rousseau and colleagues 'realized that there are cosmic insights to be gleaned from a kitchen sink.'

The fact is, this book and I were never going to get on. But don't let my view put you off - your relationship with it may be totally different.
Profile Image for Elisa.
4,310 reviews44 followers
November 13, 2025
I know that gravity is to blame when I step on a scale, but I had no idea that we all owe everything to it. In this super-approachable, entertaining and informative audiobook, Riordon explains what gravity is (to the extent that science has been able to determine), its unexpected effects and even some of its unknown aspects. Jon Vertullo narrates colloquially so that he sounds like a fun professor in the most entertaining class ever. Riordon translates the most complicated concepts into simple images that even the most scientifically-challenged person will grasp. He even includes an experiment that you can do in your kitchen sink to explain black (and white) holes. He is very honest about everything that has not been proven and some issues with the standard and quantum models. My brain is incapable of understanding Quantum Physics, but this book doesn’t delve into it too deeply, so I didn’t feel lost. There is some history, some trivia and a lot of eye-opening facts. My favorite part was about the cryptids, everything we don’t yet know for sure, but could revolutionize our world in the future. Since gravity affects us all, everyone should read this.
I chose to listen to this audiobook and all opinions in this review are my own and completely unbiased. Thank you, NetGalley/Tantor Audio.
23 reviews
November 21, 2025
It sounds like a book that's very close to everyday life, but it's actually astrophysics, and the narrative thread of this book jumps around a bit, which might deviate a bit from expectations.
Displaying 1 - 8 of 8 reviews

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