Read the passage below carefully, and then choose the best answer:
The Greatest Light Show on the Earth
If you are a fan of amazing visual displays, planetariums around the world offer some entertaining laser-light shows that are often accompanied by popular music. Yet if you want to see the world’s greatest light show, you won’t be able to catch it indoors. Instead, you will have to head to one of the Poles. In certain spots, you will be treated to colourful streaks of light dancing across the sky. This incredible display is the aurora borealis, and every year people from all corners of the globe flock to witness its wonders firsthand. The Aurora Borealis, or Northern Lights, got its official name in 1621. The name combines the name of the Roman goddess of the dawn, Aurora, and the Roman god of the north wind, Boreas. In ancient times, the aurora completely baffled people’s minds, as science was far more primitive than it is today. Nevertheless, they created many myths to explain them. The Vikings believed the lights were the reflection of dead maidens. The Scots thought they were supernatural beings battling in heaven. Meanwhile, Eskimos thought that the lights were dead souls, and when the colours changed, it was their attempt to contact living friends and relatives. It was not until 2008 that a team of scientists from ULCA finally concluded with certainty what the true cause of these dancing light is. The process begins when solar winds carry charged particles from the Sun through space and into the Earth’s atmosphere. When these charged particles enter the Earth’s atmosphere, they are magnetically attracted to the Earth’s poles. During their journey to these points, they come in contact with nitrogen and oxygen atoms in the sky. These collisions are what cause the aurora. The heights at which the collisions occur determine the colours of the individual lights. For example, when the solar winds collide with nitrogen at least than 96 kilometres above the Earth’s surface, the lights will be blue. If the same collision occurs above 96 kilometres, however, the light will be purple. Or, if the solar wind particles collide with oxygen, the colours produced will be either red or green. However, merely understanding how the aurora works does not do this phenomena justice. To truly appreciate the full splendor of the aurora, you will have to see this Natural Wonder of the World in person.
6. Where can we often see the aurora most?

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