How can I book my ticket for the Planetarium or the Argonaute?

The Planetarium and the Argonaute are spaces included in the Exhibitions ticket, they are not subject to separate tickets. When purchasing online, after selecting your arrival time at the Cité, you will be able to choose your time slot for the Argonaute as well as your Planetarium session.

Does the Metamorphoses exhibition require a separate ticket?

The children's exhibition (currently Metamorphoses) is included in the Exhibitions ticket. However, when making your purchase, it is imperative to choose your time slot in order to validate your reservation for this exhibition specifically. A price supplement for children from 2 to 5 years old accompanying the older ones will apply (+ €6.5 in general, + €5 as part of a formula).