What do aurors look like from space

What are holidays like for astronauts in space?

In space, however, time seems to pass in a strange rhythm. A “day” is difficult to define when you go around the world once every 90 minutes. So most of the 24-hour periods are fairly uniform. "The days are pretty much a routine," says Kelly. In his new book “Endurance”, the flight engineer and mission commander recalls his 520 days in space. Since there is nowhere to go and there is little real free time, most of the fun in space is watching the earth go by. (Worth reading: Earth shines in these dramatic new photos from space)

On major holidays, however, the crews sometimes deviate from the routine - at least long enough to exchange a few thoughts and toast together (with juice from a packet). In 2015, the American astronauts celebrated Thanksgiving with cold turkey pieces. One year at Christmas, Kelly tweeted a picture of the earth that he had taken (above). Country-specific holidays like American Columbus Day tend to go unnoticed. Since the crew is made up of members of the US, Russian, Japanese and European space agencies, it would otherwise be too many holidays to keep an eye on.

There is one exception, however. "New Year is a bigger holiday than Christmas on the space station because it is celebrated on the same day in all countries," says Kelly. He remembers looking down at the earth and watching the fireworks - tiny sparks of light on the great, dark planet.