I was here twice, Oct '12 and recently in Oct '13.
Actually both times I wanted to visit the Planetarium, and both times I failed.
The 1st time the guard near the Planetarium told us it was closed due to some unforeseen/unplanned business meeting (?). It was not announced on their website, neither were we informed before we got inside, and we bought the tickets for the Planetarium already, which were not refunded. Not a good example of customer service there, while staff overall is nice, friendly and speak English quite OK.
The 2nd time, we made it to the door of the Planetarium, where a guard told us we need to go back to the ticket desk and purchase a separate ticket (which meant another 30 minutes wait) to go inside the actual Planetarium. We decided not to do this.
There's an observation floor, which could be great, if it were not for the fact that all windows have been intensely covered by dotted stickers (?), hence blocking the potential nice panorama over the city and Vistula river banks.
The actual Centre has different parts. The 1st part is great for kids (history/art/commerce/science related), while the second part is more suited towards teenagers, with different semi/popular-scientific psychologic/cultural/political/personality tests and facts.
Doing the whole Centre and taking some tests, some of which will surely appeal to different kinds of visitors, can take you easily 3-4 or more hours, as there is so much stuff. Both times, at the end we skipped a lot of potentially interesting stuff, as there's simply too much to see and do.
Near the Planetarium there's a nice little coffee bar ith decent prices, if you are in need of a refreshment and break.
Also, be sure to hang your jacket in the wardrobe before you hit the cash desk, as the wardrobe is situated right next to the entry. We were already inside, jacket and all, before we found that out. Waiting time can easily amount up to 30 minutes or more, due to the inefficiently organised cash desks and the large influx of groups with kids, especially so during the weekends (Saturdays!).
Exit is strangely enough through the shop and you get a wristband and a card at the cashdesk, of which the card must be returned at the exit and I believe can be used to sum up some of the results of the tests you took inside, but I didn't get the exact hang of this.
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