Taken from the 25th anniversary issue of Physics World, this article examines one of the five biggest unanswered questions in physics as selected by the magazine’s editors Scientists and philosophers ...

What Is The Time? The concept of time feels so natural that we often forget just how peculiar it is. What actually is time? Figuring it out remains one of the trickiest problems in physics.

Time is all around us: in the language we use, in the memories we revisit and in our predictions of the future. But what exactly is it? The physicist and Nobel laureate Frank Wilczek joins Steve ...

Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric ...

Time is one of the few things we regard as regular and unchanging. But is it really so constant? We take a look at the physics of time.

What does it mean to be to space-time? The seemingly simple question gets to the essence of twentieth-century physics and has ...

Learn about physics, a science that introduces you to the underlying laws and mechanisms for how the universe works, why you should study physics.

The almost impossibly brief Planck time has been known since the 19th century. Originally dismissed as a mere curiosity, it may hold the key to understanding the universe.

Neils Bohr once said “Physics concerns what we can say about Nature." Neils Bohr said, “It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what we can ...