- Type: Natural Wonders, Sightseeing
- Time to Spend: 2 hours to Half Day
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The Northern Lights (or Aurora Borealis) can be an almost eerie sight: Picture emerald green swirls coloring the otherwise darkened sky. But scientists have a boring explanation for this phenomenal natural light show -- "collisions between electrically charged particles from the sun that enter the earth's atmosphere," according to the Northern Lights Centre. Still, it's a pretty breathtaking sight, and if you're visiting Reykjavik in winter, you might want to stake out some time for Northern Lights gazing.
Although you can see the lights from Reykjavik, you might be able to better view them outside of the city. Taking a tour is an especially good way, and most TripAdvisor travelers tend to like Iceland Excursions and Reykjavik Excursions. (But also keep in mind that the Aurora Borealis requires a perfect cocktail of climate conditions in order to show -- so you're not guaranteed to see them even if you book a tour).