Gabriela González, former Spokesperson of LIGO, explains gravitational waves, what it was like to discover them, and what they might tell us about the Universe.

How does LIGO detect gravitational waves? Here is a quick introduction.

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What is a black hole? Cosmologist Pau Figueras explains.

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Kip Thorne explains how to explore the Universe with gravitational waves.

David Tong explains one of the most important equations in science.

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Can we define an event without reference to space and time? And why would this be useful? Laura Mersini-Houghton explains.

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The renowned physicist Juan Maldacena, of the Institute of Advanced Study in Princeton, has developed a great analogy to explain the beautiful symmetries that underpin the fundamental forces and particles, including the Higgs boson: he thinks of space as a grid of countries and of particles as travellers keen on making money by speculating with currencies.

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In this interview cosmologist Marina Cortês explains how time emerges in a block universe, exploring the arguments for and against this theory, and alternative explanations where time is fundamental.

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Most of us know what we mean when we say that something has happened. For theoretical physicists, however, this isn't an easy question. Sean Carroll of the California Institute of Technology explains why it's hard to define events and what to do about it.

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Most of us know what we mean when we say that something has happened. Theoretical physicists, however, struggle with the concept of an event. Why?