SUMMARY

In 1976, Stephen Hawing proposed that Black Holes, do something impossible according to the laws of quantum mechanics. They destroy information. This is a paradox because information should be conserved in the...

SUMMARY

What if gravity repelled instead of attracted? Repulsive gravity may have shaped the entire history of our universe. For centuries gravity was defined by Isaac Newton’s Law of Universal Gravitation which...

Five areas of physics worth remembering: Classical mechanics, energy and thermodynamics, electromagnetism, Relativity, and Quantum Mechanics. Classical mechanics - two main concepts worth knowing. The first is...

Part 2 in our Multiverse series.

Seven eminent physicists, including 3 Nobel Laureates, provide real-world examples of the relevance of TOK (Theory of Knowledge) concepts in their research. This interdisciplinary TOK Sampler explores different aspects of the...

A pulsing black hole in the centre of a distant galaxy sheds light on black hole and galaxy formation. How fast are black holes rotating and how does that rotation change over its life-span?

Why doesn't anything go faster than the speed of light? Want to see the world through the eyes of a scientist?

Was the Universe Designed? Exploring the effect Dark Energy has on our Universe.

...because of Newtonian physics. But Albert Einstein and relativity had other ideas

The weird effects of Einstein's theory of gravitational time dilation.

A launch mishap led to the best experimental confirmation of gravitational redshift.

This video discusses the prediction and discovery of a supernova in the galaxy SP1149, located billions of light years away. Scientists predicted the supernova would occur in November 2015, but the event was captured earlier due to...

Time dilation and Einstein’s theory of relativity go hand in hand. Albert Einstein is the most popular physicist, as he formulated the theory of relativity, which gave the Energy mass equivalence formula and is directly related to time...

Astrophysicist Scott Tremaine (Institute for Advanced Study) describes why we believe that dark matter exists.

Princeton University physicist Paul Steinhardt describes how many cosmologists simply ignore one of the most pronounced problems with the theory of cosmic inflation.

Caltech theoretical physicist and Nobel Laureate David Politzer shares his excitement at re-appraising information loss in black holes and re-examining the mathematics of gauge theories.

Physicist Paul Steinhardt, Princeton University, describes how his interest in inflationary cosmology was piqued by a captivating talk given by Alan Guth 30 years ago, and how what he thought was going to be a few weeks' diversion has...

Princeton University physicist Paul Steinhardt describes how we might get beyond the intellectual dead-end that the theory of cosmic inflation seems to have led us to.

University of Chicago cosmologist Rocky Kolb relates how he reacts very differently to dark matter than dark energy: dark matter he regards as an opportunity, while dark energy "drives him nuts".

Physicist Paul Steinhardt, one of the original developers of the theory of cosmic inflation, describes a key problem he faced at the beginning and what his thinking was to get around some of those early hurdles.

Gravitational lensing occurs when a huge amount of matter, like a star, galaxy, or cluster of galaxies, creates a powerful gravitational field around it, strong enough to bend the light coming from distant galaxies (behind...

What happens when black holes collide? What is the speed of gravity? There are so many weird questions related to gravitational waves.

Time dilation and Einstein’s theory of relativity go hand in hand. Albert Einstein is the most popular physicist, as he formulated the theory of relativity, which gave the Energy mass equivalence formula and is directly related to time...

Press conference announcing the first direct detection of gravitational waves -- February 11, 2016