Thousands of Colorado residents took to social media on Thursday night and on Friday morning to share their views of the aurora borealis (northern lights) that were visible with the naked eye.

Northern lights dazzled skies across Colorado on Thursday. As the geomagnetic storm weakens, there’s a chance you could catch the colors Friday, too.

When the particles interact with the gases in our atmosphere, they can produce light — blue and purple from nitrogen, green and red from oxygen.