More from The National:
Tuesday's best photos: From D-Day to the Great Mosque of Djenne
Monday's best photos: from volcano offerings in Indonesia to wingwalkers in England
Sunday's best photos: from Environment Day in Dubai to Poland's Great Dragon Weekend
Saturday's best photos: from a hot day in Malaysia to a typhoon in Japan
Friday's best photos: from US Air Force graduates to Sevilla's Europa League win
Thursday's best photos: from the royal wedding in Jordan to protests in Germany
Wednesday's best photos: from Manhattanhenge to wildfire fighting
Venue: Sharjah Cricket Stadium
Date: Sunday, November 25
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
The results of the first round are as follows:
Qais Saied (Independent): 18.4 per cent
Nabil Karoui (Qalb Tounes): 15.58 per cent
Abdelfattah Mourou (Ennahdha party): 12.88 per cent
Abdelkarim Zbidi (two-time defence minister backed by Nidaa Tounes party): 10.7 per cent
Youssef Chahed (former prime minister, leader of Long Live Tunisia): 7.3 per cent
Who's who in Yemen conflict
Houthis: Iran-backed rebels who occupy Sanaa and run unrecognised government
Yemeni government: Exiled government in Aden led by eight-member Presidential Leadership Council
Southern Transitional Council: Faction in Yemeni government that seeks autonomy for the south
Habrish 'rebels': Tribal-backed forces feuding with STC over control of oil in government territory