what is it with these sailor moon posts?

so lately I've been getting a lot of sailor moon related gifs and pictures and fanart on my tumblr dash,
so I was wondering if that is supposed to be a trending thing on tumblr atm?

or has it always been a thing (from nostalgia I guess)... or is it because Im following certain blogs and no one else is rly getting them?? ANSWERS I WANNA KNOW