WHAT IS A BLACK HOLE?
1. Black holes are objects whose gravity is so strong not even light can escape their pull
2. They can be created when massive stars collapse under their own weight
3. Large black holes can also be formed when smaller ones collide and merge
4. The biggest black holes lurk at the centre of many galaxies, including our own
5. Astronomers believe that when the universe was very young, black holes affected how galaxies formed
While you're here
National Editorial:Â Why is a Muslim Brotherhood-linked app still on Apple and Google Play?
Damien McElroy:Â Europe's response to Islamist extremism is encouraging but not enough
Con Coughlin:Â How extremists are using Zoom and other tools to exploit this pandemic
