Rotating black holes suck up anything that gets near enough.
Twisted sound beams suggest an advanced civilisation may be able to harness immense amounts of power from a black hole.
It's all about the strong gravitational field of the black hole.
What could a ‘relativistic camera’ capture on the way to Alpha Centauri?
An astronomer suggests an idea to piggyback on the ambitious Breakthrough Starshot project that aims to send nano spacecraft to Alpha Centauri at a major fraction of the speed of light.
Space: it’s full of stars … isn’t it?
If there are infinite stars – where is all the light?
Ripples in a pond help to illustrate wave motion and the Doppler effect.
When an ambulance passes with its siren blaring, you hear the pitch of the siren change: as it approaches, the siren’s pitch sounds higher than when it is moving away from you. This change is a common…