© Tobias Roetsch
The cosmos is full of odd and extreme phenomena. Take everyone’s favourite behemoth, the black hole, for example. These dark, mysterious objects hungrily devour anything and everything within their reach. However, there is a light side to accompany the dark - and the dark black hole has its light equivalent in the intriguing white hole.
In simple terms, white holes are time-reversed black holes. If you were somehow able to film a black hole in action and play the tape in reverse, you would see a white hole. Rather than furiously dragging in and trapping matter, as a glutinous black hole does, a white hole spews material out into space, allowing nothing to enter it.