Astronomers have long been puzzled by two strange phenomena at the heart of our galaxy. First, the gas in the central ...

We tend to understand this using a simplified model in which we imagine matter is made of spherical particles. In this model, solids have particles fixed tightly together in rows so they can’t move.

Matter is made up of small particles called atoms. Atoms can exist on their own or together as molecules. Atoms are very small and around 100,000,000 of them end to end would measure 1 centimetre.

You might think space is empty. But in the mysterious world of physics, things aren’t always as they seem. Empty space is ...

Collisions between certain subatomic particles can produce matter/antimatter pairs, so one possible explanation is that ...

Yet dark matter might not be one particular particle—it may be a whole hidden sector of dark particles and forces. In this dark sector, particles would interact through their own independent ...

The properties of a substance are the properties of a huge number of particles together. In this episode, Dr Sunayana Bhargava and Tulela Pea explore the states of matter: solid, liquid and gas.