The Planetarium is the main center for the dissemination of astronomy in the city.

It has a semi-spherical projection room with 360 reclining seats and a dome 20 meters in diameter where nearly 8,900 stars, planets and satellites of the universe are reproduced, and thematic documentaries are projected, thanks to an imposing team (of 5 meters of height and 2.5 tons of weight) that contains about one hundred projectors and that is located in the center of the room.

The building has five floors, six stairs (one helical), the central projection room and another smaller room used for temporary samples.

Its construction began in 1962 and ended in 1966. The Planetarium also houses a collection of meteorites from northern Argentina.

In the adjacent lake is the Surprised sculpture, by the Italian Nicolás A. Ferrari and a few meters away, an evocative monolith of the Polish sage Nicolaus Copernicus.

In these lands the first match of soccer of the Argentine history was played (29 of June of 1867), that faced the equipment of the Buenos Aires Cricket Club with the crew of the British warship Bombay.