`Author:` Carlo Rovelli `Availability:` [[Available Books]] ## Summary ## Key Takeaways ## Quotes - ## Notes > [!info] > ![[White Holes.jpg]] `Concepts:` `Knowledge Base:` [[Books index]] ## Highlights - These are the equations that convinced physicists to revise their ideas on the nature of time and space, showed that clocks go faster in the mountains than in the plains; that the universe is expanding; that there are waves of space – and so on. The equations that we use today for studying the cosmos - Note: Research how relativity relates to these... - In the course of these pages, we will have a close but uneasy relationship with these equations: they will serve as our guide, like Virgil to Dante in the Divine Comedy, because they encapsulate the best understanding that we have today of space, time and gravity. They are our tool for understanding. They tell us what to expect at the edge of a black hole and inside it. They also tell us what white holes are. They show us a route through these strange territories - Note: Th Divine Comedy is a metaphor for physics maybe.. As well as other things - If a mass is extremely concentrated, it generates a shell around itself, a spherical surface, where everything becomes bizarre: on this surface, clocks – which always slow down in the vicinity of any mass – even come to a stop. Time freezes. It no longer flows. Space, for its part, elongates in the direction of the mass, stretching like a long funnel, and on this absurd spherical surface the stretching becomes a tear - Note: Schwarszchild... his theory