On Wednesday night Iceland's capital Reykjavik switched off the street lights in certain parts of the city. No, this wasn't a desperate bid by the council to save money on its electricity bills, but to give people a better view of the Northern Lights.
-- Do More Asgeir (@DoMoreAsgeir) September 28, 2016
And boy, was it incredible.
-- Daði Guðjónsson (@dadigud) September 29, 2016
-- Carrie Arnold (@edbites) September 29, 2016
-- RustyBertrand (@RustyBertrand) September 29, 2016
-- Iceland Photos (@dorisig) September 29, 2016
So blessed to be able to see the Northern Lights, not once but thrice in a row. This time even right in the middle of Reykjavik. pic.twitter.com/8ZaOzFO86o
-- Daniel Subramaniam (@drs94) September 29, 2016
-- Tiny Iceland (@TinyIceland) September 29, 2016
Street lights were off for an hour (between 10pm and 11pm), and residents were asked to switch off their own lights to reduce light pollution in the city as much as possible. This allowed for the best view of the Aurora Borealis, which was predicted to have heightened activity.
And people just couldn't get over it.
I hope everyone saw the stars and the northern lights tonight. It was breathtaking?? the sky is a wonderland no doubt.
-- tori hula (@torihulaa) September 29, 2016
Pics of the northern lights in Iceland tonight was crazy.
-- LOW (@OhWell_Lowell) September 29, 2016
#northernlights sure put on a good show last night. Encore please!
-- Prone To Roam (@pronetoroamblog) September 29, 2016
It wasn't just Reykjavik that got a good seat to the show, but other places from Greenland to Canada also got a brilliant eyeful of the Northern Lights.
Northern lights back @ home in 99766? pic.twitter.com/xQRZfLVXth
-- Jennifer (@jayla_12) September 29, 2016
-- Images By Stan (@ImagesByStan) September 29, 2016
-- Scott Foss (@scottfoss) September 29, 2016
Look at the northern lights tonight! pic.twitter.com/uZUCPOrxns
-- EVERY MAN JACK (@everymanjack) September 29, 2016
That's right, you could even see them from Northumberland.
So what actually is this magical display of colour and light? The lights are the result of collisions between charged particles from the sun and the earth's atmosphere. There you go: Now you can wow all your friends.