The following photos are shortlisted in 2017's Insight Astronomy Photographer of the Year. The awards will be announced on September 14, and the exhibition opens September 16 at The Royal Observatory Greenwich

A stargazer observes the constellation of the Big Dipper perfectly aligned with the window of the entrance to a large glacier cave in Engadin, Switzerland. This is a panorama of two pictures, and each is a stack of another two pictures: one for the stars and another one for the foreground, but with no composing or time blending.

Engadin, Graubünden, Switzerland, 29 December 2016