Very cool structure, very unclear about their hours. We stopped at the Planetarium after spending the day in Recoleta. There was a sign posted on the gate saying that there would be a shot at 5pm. Tons of people showed up and kept looking around, but the place looked closed. Their website and the sign both said they were open on holidays (it was Carnival), but they were clearly not open. The building itself is really very cool to look at, but the show they advertise is the same as the one in AMNH in Manhattan... just in Spanish.