A new understanding of the universe is wending its way into our world. What is it? Where does it come from? First let’s look at the old understanding. The Big Bang is the standard model of cosmology. It is based on general relativity and on evidence that space itself is expanding. It projects this picture […]
How do things move? At first glance this may not seem to be a problem. We tend to take motion for granted. But a long-standing mystery lies behind it. Now new answers are becoming clear, with cutting-edge insights into the nature of space and time and matter. Philosophy and physics have long studied motion (aka […]
Physics beat out chemistry to become the Senior Science in the second physics revolution starting around 1900. A hundred years ago this revolution held huge promise. Now historians of science call it the Unfinished Revolution. What went wrong? It is a strange but, in the end, illuminating five-part story. Part One: In 1851 mathematician Bernhard […]
Scientists are building better ways to look back into time. A discovery announced last week may be the most exciting thing in physics: a big black hole (called SDSS J0010+2802). It’s not just big; for its age it is a monster. It compels us to rethink our current concepts of the universe. How can we […]
We need a New Year’s Revolution. (No typo: Revolution with a v.) Last week I suggested that the Large Hadron Collider may find no superparticles and that this could lead to a big change in physics. Indeed a common theme in last year’s posts was the need to complete the Physics Revolution that began a […]
The idea of the universe as a single thing has roots in ancient societies. It speaks to our existential questions: Where are we? What is our relation to the world? In the fifth century BCE, Zeno of Elea ponders whether the world is one thing or many. He says the concept of plurality is a […]
Understanding physics can be satisfying. Understanding physics some physicists don’t understand brings super-satisfaction. Many think they can’t understand physics. Seems to me that often it is physicists they can’t understand. I think anybody who can figure how to travel to another country can, with no more effort, understand a lot of physics. With two provisos: […]
Motion is smooth, as any eye can see. In 1738, Scottish philosopher David Hume could―with little chance of challenge―say: ‘The infinite divisibility of space implies that of time, as is evident from the nature of motion.’ But physics now knows that, at scales far smaller than an atom, space isn’t smooth and motion must […]
Man in motion (myself, not the Night Ranger album), I could get conflicted (once again): The universe moves on, I see this, yet I know it never moves. It has no way to move. It has no time. At any given now it simply is; so now is all it ever has. It is a […]