Black Holes, Tides, and Curved Spacetime: Understanding Gravity

Rated 5 out of 5 by from Excellent Review of Gravity A delightful and educational review of gravity directed towards the layperson or any person interested in how the world works. All the explanations are presented in an intuitive fashion with basic algebra only used to cement relationships. Even if one is far removed from the language of mathematics the principles and concepts are presented in a clear and succinct language. A five star presentation by a remarkable instructor. I learned something in every lecture. Michael Gilbreath MD / South Carolina.
Date published: 2020-09-02
Rated 5 out of 5 by from Terrific course! Excellent explanation of physical laws with just enough math and visuals.
Date published: 2020-07-22
Rated 4 out of 5 by from Good But Not Five Stars Overall,I liked the course. I had some difficulty tracking Gravity to each lecture (some lectures didn't mention gravity until the end). I found Professor Schumacher's voice level and tone to be annoying as though he was speaking to a large college class of 100 plus students. I found myself constantly adjusting the DVD volume.
Date published: 2020-07-12
Rated 5 out of 5 by from Interesting content The instructor delivered the material well and was accompanied by helpful illustrations. My goal was to consolidate and enhance my knowledge of gravity, and this course delivered. It does include many equations but they are explained well and you do not have to remember them; the instructor reviews each equation again when it is re-introduced. Comprehensive historical perspective on our understanding of gravity is embedded throughout. Also lots of interesting facts that I have not encountered before are included. Overall a fun and interesting course.
Date published: 2020-07-05
Rated 5 out of 5 by from excellent course, great instructor both the level of information and the presentation are excellent!
Date published: 2020-06-08
Rated 5 out of 5 by from My First Course This was the first course I purchased from the Great Courses, I was very lucky as this is one of the finest courses in their whole repertoire. I have since purchased many courses and thoroughly enjoyed them, not all have been as good as this I might add but this course is excellent, probably the best. The science is first rate, the delivery by Professor Schumacher is excellent. He covers the early work and and a brief synopsis of the lives of Copernicus, Galileo, Kepler, Newton and moves on to Einstein and you know intuitively what he's talking about and it all makes sense. The experiments and visuals are really very first rate. I now understand what we don't know about Dark Energy and Dark Matter after completing the course. This doesn't mean I've solved the mystery but I do know what we don't know yet. The biggest negative of watching this course was I had to learn more about the subject and I ended up buying the cosmology and astronomy courses, plus supporting text books. I will say in passing those two courses are also very good but Understanding Gravity has the edge. I learnt a great deal from this course and Professor Schumacher is a real inspiration. Well done Great Courses.
Date published: 2020-05-12
Rated 5 out of 5 by from Engaging content! I bought this course for my husband, who is an astronomy buff. He's loving it.
Date published: 2020-05-11
Rated 2 out of 5 by from I learned new idea but had to work very hard to do I bought this because I've always wanted to better understand the genius of Einstein and all he contributed to physics. The first half of the course was instead a history of various ideas though out history about gravity . I already was familiar with most of this, but enjoyed a few of the lectures despite finding them a bit condescending. I was really disappointed when I got to Einstein's theories of Special and General Relativity. Granted these are not easy topics to explain, but Professor Schumacher's presentation was disjointed and not logical in its development. He spent a good part of every lecture reviewing things that I learned in high school or college physics. Then when he got to the material with which I was unfamiliar, he continued with his somewhat superficial, often misleading and sometimes even inaccurate presentation that was meant more to entertain than inform. When I tackle a challenging Great Course like this, I take notes to highlight the key points and add material from other sources that I might find on line. Normally, the lecturer provides me with the outline for my notes, but not so for Schumacher. It is only through my efforts at organizing the material that I was able to learn about the topics to which I had not previously been exposed. I was a university professor for 43 years, and I always considered it my job to gather and organize information so my students could better understand a topic. I did that for this course, but Schumacher did not.
Date published: 2020-05-05
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Black Holes, Tides, and Curved Spacetime: Understanding Gravity
Course Trailer
The Strangest Force
1: The Strangest Force

Begin your exploration of gravity with Isaac Newton and the famous story of the apple. Why was it such a breakthrough to connect a falling apple with the faraway moon? Review the essential characteristics of gravity and learn why small asteroids and large planets have such different shapes.

33 min
Free Fall and Inertia
2: Free Fall and Inertia

Review three great discoveries by the "grandfather" of gravity research, Galileo Galilei. His most famous experiment may never have happened, but his principle of inertia, law of free fall, and principle of relativity are the basis for everything that comes later in the science of gravity-including key breakthroughs by Einstein.

29 min
Revolution in the Heavens
3: Revolution in the Heavens

Drawing on ideas and observations of Nicolaus Copernicus and Tycho Brahe, Johannes Kepler achieved a great insight about gravity by discovering three laws of planetary motion, relating to the mathematics of orbits. The cause of planetary motion, he determined, must lie in the sun.

28 min
Universal Gravitation
4: Universal Gravitation

See how Newton was able to finish Kepler's revolution by formulating the law of universal gravitation, which says that every object exerts an attractive force on every other object. Also explore Newton's related discovery of the three laws of motion, which underlie the science of mechanics.

28 min
The Art of Experiment
5: The Art of Experiment

Learn how distances in the solar system were first determined. Then chart Henry Cavendish's historic experiment that found the value of Newton's gravitational constant. Cavendish's work allows almost everything in the universe to be weighed. Then see a confirmation of the equivalence principle, which says that gravitational and inertial mass are identical.

30 min
Escape Velocity, Energy, and Rotation
6: Escape Velocity, Energy, and Rotation

Begin the first of several lectures that dig deeper into Newton's laws than Newton himself was able to go. In this lecture, apply the key concepts of energy and angular momentum to study how gravity affects motion. As an example, use simple algebra to calculate the escape velocity from Earth.

29 min
Stars in Their Courses-Orbital Mechanics
7: Stars in Their Courses-Orbital Mechanics

Newton was the first to realize that objects could, in theory, be sent into orbit around Earth. Explore how this works in practice, using the ideas of energy and angular momentum to study how satellites, moons, planets, and stars move through space.

29 min
What Are Tides? Earth and Beyond
8: What Are Tides? Earth and Beyond

Trace the origin of tides to the simple fact that gravity varies from point to point in space. This leads not just to the rise and fall of the ocean, but to the gradual slowing of Earth's rotation, Saturn's spectacular ring system, volcanoes on Jupiter's moon Io, and many other phenomena.

30 min
Nudge-Perturbations of Orbits
9: Nudge-Perturbations of Orbits

For the next three lectures, study the effects of gravity on the motions of more than two bodies. Here, see how even very small orbital changes-small perturbations-are significant. Such effects have revealed the presence of unknown planets, both in our own solar system and around other stars.

28 min
Resonance-Surprises in the Intricate Dance
10: Resonance-Surprises in the Intricate Dance

Resonance happens whenever a small periodic force produces a large effect on a periodic motion-for example, when you push a child on a swing. Learn how resonance due to gravitational interactions between three bodies can lead to amazing phenomena with planets, asteroids, and rings of planets.

29 min
The Million-Body Problem
11: The Million-Body Problem

Consider the problem of gravitational interactions between millions of bodies, such as the countless stars in a galaxy. Amazingly, mathematics can reveal useful information even in these complicated cases. Discover how the analysis of the motions of galaxies led to the prediction of dark matter.

32 min
The Billion-Year Battle
12: The Billion-Year Battle

Explore the physics of stars, which are balls of gas in a billion-year battle between the inward pull of gravity and the outward pressure produced by nuclear fusion. Follow this story to its ultimate finish-the triumph of gravity in massive stars that end their lives as black holes.

30 min
From Forces to Fields
13: From Forces to Fields

For the rest of the course, focus on the revolutionary view of gravitation launched by Albert Einstein. Review new ideas about fields that allowed physics to extend beyond Newtonian mechanics. Then see how Einstein modified Newton's laws and created the special theory of relativity.

31 min
The Falling Laboratory
14: The Falling Laboratory

Einstein focused on gravity in his general theory of relativity. Hear about his "happiest thought"-the realization that a man in free fall perceives gravity as zero. This simple insight resolved a mystery going all the way back to Newton and led Einstein to the startling discovery that gravity affects light and time.

31 min
Spacetime in Zero Gravity
15: Spacetime in Zero Gravity

In an influential interpretation of relativity, Einstein's former mathematics professor Hermann Minkowski reformulated the theory in terms of four-dimensional geometry, which he called spacetime. Learn how to plot events in this coordinate system in cases where gravity is zero.

29 min
Spacetime Tells Matter How to Move
16: Spacetime Tells Matter How to Move

See how gravity affects Minkowski's spacetime geometry, discovering that motion in a gravitational field follows the straightest path in curved spacetime. The curvature in spacetime is not caused by gravity; it is gravity. This startling idea is the essence of Einstein's general theory of relativity.

31 min
Matter Tells Spacetime How to Curve
17: Matter Tells Spacetime How to Curve

The curvature of spacetime depends upon matter-and tidal effects. In this lecture, see how ordinary tidal effects reveal a simplified form of Einstein's greatest discovery: the equation governing the curvature of spacetime by matter.

30 min
Light in Curved Spacetime
18: Light in Curved Spacetime

See how Einstein's general theory of relativity predicts the bending of light in a gravitational field, famously confirmed in 1919 by the British scientist Arthur Eddington. Learn how this phenomenon creates natural gravitational lenses-and how the bending of light reveals invisible matter in deep space.

30 min
Gravitomagnetism and Gravitational Waves
19: Gravitomagnetism and Gravitational Waves

The general theory of relativity predicts new phenomena of gravity analogous to those of electromagnetism. Discover how ultra-sensitive experiments have detected the gravitomagnetism of the Earth, and follow the search for elusive gravitational waves that travel through space.

31 min
Gravity's Horizon-Anatomy of a Black Hole
20: Gravity's Horizon-Anatomy of a Black Hole

Plunge into the subject of black holes, which are massive objects that have collapsed completely under their own gravity. Learn how black holes distort spacetime and explore the supermassive black holes that lie at the hearts of galaxies. Then ask: Are there such things as micro-black holes?

33 min
Which Universe Is Ours?
21: Which Universe Is Ours?

Investigate what Einstein called his "greatest mistake"-his rejection of his own theory's prediction that spacetime should be dynamic and evolving. Chart the work of a group of scientists, including Alexander Friedman, Georges Lemaître, and Edwin Hubble, who advanced the realization that our universe is expanding from an apparent big bang.

30 min
Cosmic Antigravity-Inflation and Dark Energy
22: Cosmic Antigravity-Inflation and Dark Energy

Using everything you've learned about gravity, investigate cosmic antigravity, starting with cosmic inflation, a phenomenon that exponentially increased the size of the universe during the big bang. Then, learn why dark matter cannot be made of ordinary protons and neutrons, and explore the recent discovery that the expansion of the universe is accelerating, powered by a mysterious dark energy inh...

32 min
The Force of Creation
23: The Force of Creation

Use a black hole to test the laws of thermodynamics, taking a deeper look at the capacity of gravity to pull matter together and increase entropy at the same time. Probe Stephen Hawking's most surprising discovery, and then learn that the same force that pulls the apple down and steers the stars in their courses is also nature's ultimate source of order and complexity.

29 min
The Next Revolution
24: The Next Revolution

Survey the greatest unsolved problem in theoretical physics: the search for a quantum theory of gravity. Examine string theory, loop quantum gravity, and also entropic gravity, which suggests a revolutionary link with thermodynamics. Close the course with a deepened appreciation for the connection between everyday features of gravity and the most exciting questions in contemporary physics and cosm...

32 min
Benjamin Schumacher

Gravity is about both phenomena near at hand at the human scale, everyday and intuitive, and phenomena far off at an astronomical scale.


The University of Texas at Austin


Kenyon College

About Benjamin Schumacher

Dr. Benjamin Schumacher is Professor of Physics at Kenyon College, where he has taught for 20 years. He received his Ph.D. in Theoretical Physics from The University of Texas at Austin in 1990. Professor Schumacher is the author of numerous scientific papers and two books, including Physics in Spacetime: An Introduction to Special Relativity. As one of the founders of quantum information theory, he introduced the term qubit, invented quantum data compression (also known as Schumacher compression), and established several fundamental results about the information capacity of quantum systems. For his contributions, he won the 2002 Quantum Communication Award, the premier international prize in the field, and was named a Fellow of the American Physical Society. Besides working on quantum information theory, he has done physics research on black holes, thermodynamics, and statistical mechanics. Professor Schumacher has spent sabbaticals working at Los Alamos National Laboratory and as a Moore Distinguished Scholar at the Institute for Quantum Information at California Institute of Technology. He has also done research at the Isaac Newton Institute of Cambridge University, the Santa Fe Institute, the Perimeter Institute, the University of New Mexico, the University of Montreal, the University of Innsbruck, and the University of Queensland.

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