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What are the Northern Lights (Aurora Borealis)?

https://geo.mtu.edu/weather/aurora

“The Northern Lights, known also as aurora borealis are a natural display of light in the northern hemisphere's night sky. Auroral displays appear in many hues—though pale green and pink are most common. Shades of red, yellow, green, blue, and violet are also reported.” (the page’s own description)

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