What else were you expecting to find?
Space is nothing but a vacuum and I presume building a museum of this is a relatively simple task. You just have to build the room and leave it empty because there are no artifacts that can better display air except for air itself. This is one of those dry humor signs that have one of two effects, either you love it or you think it is super lame. The former group has a much better sense of humor and can appreciate the irony and pun in this statement. The latter group was probably expecting something from the moon or a NASA expo.
Simon says, “I want my selfie stick, now! Britney.” Now come on Simon, you guys already had a chat about your selfie stick and it seems like there was an ultimatum. If you didn’t believe Britney when she told you, I am sure that the message came through loud and clear this time. Somehow you should have known that something like this was bound to happen. Now the roles have changed and it is now, “Britney says, you will not get your selfie stick.” Hard luck, Simon, perhaps next time you will listen carefully when Britney speaks, especially when she gives you an ultimatum.