The reduced-price tickets are available every week for showings after 5:30 p.m. on Thursday but you have to reserve online, as entry is limited.
The $8 ticket cost includes two films in the official language of your choice. The current programming includes Birth of Planet Earth, a voyage through the cosmos, and Continuum, a journey through the splendour of space and time.
On a normal day, adults pay $16.50 for two films.
A March 23 Instagram post by Espace pour la vie — which manages Montreal's Botanical Garden, Biodome and Insectarium — said tickets are already sold out for March 25.
Tickets are available for April 1 and the following Thursdays.
$8 Thursday Evenings at the Planétarium Rio Tinto Alcan
When: Every Thursday — tickets go fast
Address: 4801, ave. Pierre-de Coubertin