the biggest is called carl sagan, with a diameter of 23 meters, and seating for 263 people, but there are numerous other facilities at the site, including a library, with approximately 2,500 books, a theatre and a restaurant.  

on offer at the planetarium, are a number of activities including, dome sessions, interactive experiments, observations with a telescope, courses, lectures and exhibitions, as well as the special 'sleeping with the stars' project, for children aged 7 to 11, who can spend a night in the planetarium. 

planetarium, rua vice-governador rubens berardo, 100, gávea, tel. 21.2274.0046,  - here is the website, contact email, and map.