Space-Related Things to See in Berlin?

Hallo!

I am visiting Berlin for the first time in February (I know, a very grey time, but I am going for my birthday which happens to be at a sad time of the year) and I am interested in taking a half-day or full day to see things related to the space race, especially things related to Yuri Gagarin and Valentina Tereshkova. So far, I plan to visit Allee der Kosmonauten and the Orbitall Space Centre, but I am hoping that locals or more experienced tourists may know of more related placed I can go. If there are other museums, historic streets, murals, or anything related to space, I would love to hear about them.

Danke!