What is gravity ‘made of’?

Time has occupied the greatest minds for centuries and we’re still none the wiser about its absolute nature. Although there’s nothing in physics that says time must flow in a certain direction, nor pr

Our eyes paint such vivid portraits of the world around us that it’s easy to forget how much of our surroundings go unseen. Wi-Fi signals pinging this way and that, subatomic particles and radiation z

The difficulty in creating a theory of ‘quantum gravity’ is that the two ideas look at the Universe at completely different scales. Quantum mechanics looks at the smallest scales of the particles that

It’s one of the most basic concepts in physics, governing the behaviour of everything from subatomic particles to galaxies

Flicking through the pages of BBC Sky at Night Magazine each month, you’d be forgiven for thinking astronomers have black holes pinned down. Whether it’s the dramatic imaging of black hole shadows by

20 amazing answers t o curious