Black Holes

Black Holes
Show More

Related videos

Curved Spacetime and Black Holes
By developing a general theory of relativity incorporating gravity, Einstein launched a revolution in our understanding of the universe. Trace how his idea that gravity results from the warping of spacetime led to the discovery of black holes and the big bang.
Black Hole Entropy
Stephen Hawking showed that black holes emit radiation and therefore have entropy. Since the entropy in the universe today is overwhelmingly in the form of black holes and there were no black holes in the early universe, entropy must have been much lower in the deep past.
The Science of Information - From Language to Black Holes
The science of information is the most influential, yet perhaps least appreciated field in science today. Never before in history have we been able to acquire, record, communicate, and use information in so many different forms. Never before have we had access to such vast quantities of data of every…
Einstein's Relativity and the Quantum Revolution - Modern Physics for Non-Scientists, 2nd Edition
"It doesn't take an Einstein to understand modern physics," says Professor Wolfson at the outset of these twenty-four lectures on what may be the most important subjects in the universe: relativity and quantum physics. Both have reputations for complexity. But the basic ideas behind them are, in fact, simple and…
Time Travel, Tunneling, Tennis, and Tea
What are the two big ideas of modern physics? How can nonscientists gain a handle on these ideas and the radical changes they bring to our philosophical thinking about the physical world?
Heaven and Earth, Place and Motion
Understanding motion is the key to understanding space and time. Is there a "natural" state of motion? Learn why the ancients gave different answers to this question, and how Copernicus, Kepler, and Galileo laid the foundation for a new approach.
The Clockwork Universe
Isaac Newton was born in 1642, the year that Galileo died. You'll learn how he built on the work of Galileo and Kepler, developing the three laws of motion and the concept of universal gravitation. You'll learn why Newton's laws suggest a universe that runs like a clock.
Let There Be Light!
The study of motion is not all there is to physics. By the 18th century, scientists were delving into the relationship between the two phenomena. Today, electromagnetism is known to be responsible for the chemical interactions of atoms and molecules and all of modern electronic technology.
Speed is Relative to What?
In mechanics (the branch of physics that studies motion), the principle of Galilean relativity holds - meaning that the laws of mechanics are the same for anything in uniform motion. Is the same true for the laws of electromagnetism?
Earth and the Ether - A Crisis in Physics
In the 1880s, Albert Michelson and Edward Morley conducted an experiment to determine the motion of Earth relative to the ether. You'll learn about their experiment, its shocking result, and the resulting theoretical crisis.
Einstein to the Rescue
In 1905 a young Swiss patent clerk named Albert Einstein resolved the crisis that flowed from the Michelson-Morley result. When Einstein discarded the ether concept and asserted that the principle of relativity holds for all of physics, mechanics as well as electromagnetism, he was making a simple claim with almost…
Uncommon Sense - Stretching Time
Why does the simple statement of relativity - that the laws of physics are the same for all observers in uniform motion - lead directly to absurd-seeming situations that violate our commonsense notions of space and time?