I guess in my case this was a Mandela effect. I asked this person on Facebook, and I think it was an educated guess. I will say that there is an unusual larger number of space sets this year. City, Technic, Dreamz, Friends, Mini-figures, Duplo, etc. all have space sets this year. I believe this was conscious decision to make an unusual number of space sets. I haven't seen Lego post anything about 60 years of space, but it's possible that they are releasing a lot of space sets this year for their 60th anniversary.