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In relativity, such an extended distribution of matter is called a fluid.
Sean M. Carroll • The Biggest Ideas in the Universe: Space, Time, and Motion
Six Not-So-Easy Pieces: Einstein's Relativity, Symmetry, and Space-Time (Helix Books)
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In physics, you identify clues that reveal fundamental truths. You use those clues to build models that help explain the world around you.
Safi Bahcall • Loonshots: How to Nurture the Crazy Ideas That Win Wars, Cure Diseases, and Transform Industries
Astrophysicists apply the tenets and tools of general relativity and quantum mechanics to very different classes of problems.
Neil de Grasse Tyson • Astrophysics for People in a Hurry (Astrophysics for People in a Hurry Series)
The Power Law of Distribution
Peter Thiel, Blake Masters • Zero to One
gravity involves not one but a superposition of spacetime geometries.
Thomas Hertog • On the Origin of Time: Stephen Hawking's Final Theory
Some macrostates, like when a collection of gas molecules is distributed uniformly through a box, correspond to a large number of possible microstates.