Kip Thorne explains how to explore the Universe with gravitational waves.
Can we define an event without reference to space and time? And why would this be useful? Laura Mersini-Houghton explains.
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.
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.
Quantum mechanics suggests that observers can influence the outcomes of measurements. If that's the case, then do these observers need to be conscious? Does consciousness play a special role in physics at all?
Modern theories suggest that the Universe really is unimaginably large — perhaps it's infinite, but even if it's not, it's so large it may as well be. But does this sheer scale affect how we reason about cosmology? In this video interview, we talk to David Wallace to find out more.