91av

Skip to content

Black holes

Definition

Black holes

Black holes are objects with an intense gravitational pull so strong that not even beams of light, the fastest things in the universe, can escape. This makes them impossible to see directly, and so astronomers have had to use a variety of clever techniques to confirm that they actually exist.

The multiverse - are there multiple universes?

Question

Are there multiple universes?

Dark matter

Definition

Dark matter

Pentaquark

Physics

Bizarre pentaquark turns out to be a new kind of subatomic 'molecule'

News

We've seen signs of a mirror-image universe that is touching our own

Space

We've seen signs of a mirror-image universe that is touching our own

Features

Chien-Shiung Wu

People in Science

Chien-Shiung Wu

Causality

Definition

Causality

The secret of dark matter could be a particle the size of a planet

Physics

The secret of dark matter could be a particle the size of a planet

Features

The kilogram has been transformed as new definition takes hold

Physics

The kilogram has been transformed as new definition takes hold

Regulars

Kate Shaw

Physics

Physicist Kate Shaw on Higgs bosons and how reality is an illusion

Kate Shaw uncovers cosmic secrets at CERN’s Large Hadron Collider. She reveals what particles tell us about the world – and how Stephen Hawking inspired her

Regulars

Physics

Axions may or may not exist - but we're not just making things up

Comment

Definition

Quantum physics

Definition

Schrödinger’s cat

Definition

Uncertainty principle