I saw over 5000 sunrises and sunsets on the @Space_Station, but I’ve never …

I saw over 5000 sunrises and sunsets on the , but I’ve never spent more than a day in the total darkness of a cave on . Let the training begin. Six days of exploration await.

http://blogs.esa.int/alexander-gerst/2019/09/12/meet-the-cavenaut-alexander-gerst/ …