Americans head to the polls on November 8 to pick their president. We take a look at which are the key battleground states that can swing the vote.
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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
Moon Music
Artist: Coldplay
Label: Parlophone/Atlantic
Number of tracks: 10
Rating: 3/5