I went on a hunt for a few of these when I was in Stockholm recently and it was a bit disappointing. We couldn't find a sign at the globe and lots of places were shut. Venus is now a building site and we couldn't find Jupiter at the airport. We found the Earth and moon, Mars and Mercury (from a distance). It is a good way to explore and you get good value out of a T-bana pass.

Edit: If anyone is interested I can write up the hunt. Got some good photos. It was this or a visit to https://en.wikipedia.org/wiki/Ytterby and I think the solar system was the best choice. They should really promote these attractions more.