April 07, 2021
More galleries from The National:
Step into a 1,000-year-old Turkish bath in Gaza - in pictures
Take a virtual tour of the Roman ruins of Palmyra in Syria - in pictures
Christians celebrate Easter in Jerusalem's Old City - in pictures
Wildlife thriving in Shareen Nature Reserve at Saudi Arabia's Al Ula - in pictures
Saudi Green initiatives: everything you need to know about plan to plant 50 billion trees
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
Brodie Owen: Scientists warn Covid vaccine won’t be a ‘silver bullet’
Nick Webster: Vaccine confidence and flu shot key to tackling Covid
Damien McElroy: Anti-science attitudes in America are proving lethal
Install an air filter in your home.
Close your windows and turn on the AC.
Shower or bath after being outside.
Wear a face mask.
Stay indoors when conditions are particularly poor.
If driving, turn your engine off when stationary.