Far from any significant source of artificial light, the Erg Chebbi dunes near Merzouga offer some of the clearest night skies available in Morocco. On a clear night, particularly around a new moon, the Milky Way is visible to the naked eye, along with a noticeably higher density of stars than most travelers are used to seeing.
This isn’t a separately bookable activity so much as a natural feature of spending a night at a desert camp — most camps are set up specifically away from any lighting that would interfere with the view, and many guests simply spend time outside their tent after dinner taking it in.
For the best experience, check the moon phase when planning your desert camp night — the days around a new moon offer the darkest skies and the clearest view of the stars.