I cannot possibly imagine NOT playing space games - any space games.
Since as far back as I can remember I've been fascinated by space and longed to travel beyond the confines of this planet. My earliest toys that I actually asked for were ray guns. I had a metal scale model of Thunderbird 3 and one of Fireball XL5. Later I built plastic kit models of the luner lander and the Enterprise.
My favourite cartoons were all to do with space and every time the Bugs Bunny show was on I'd pray that it would have one of the episodes with the Martian (where was the kaboom?) or (Daffy) Duck Dogers. The first film I saw by myself on the big screen at a real cinema was 2001 : a Space Odyssey when I was 10 years old.
My dad was a space nut too and he and I used to watch Forbidden Planet religiously every time it was on TV. We used to watch all the old B-grade 50s SF movies together as well - they are some of the happiest memories I have of the old man. The earliest memories I have of being read to at bedtime are of dad reading me Jules Verne stories. He let me sit up late at night to watch the liftoff of Apollo 11, and let me wag school the day the Eagle landed on the moon, so I could watch it happen.
I can recite verbatim more of the original series Star Trek episodes dialogue than is healthy for any person, and have a collection of over 200 SF films on DVD & Blu-ray.
Then in the 1980s I discovered Elite, and later the Frontier games, and just about every other SF game set in space you can name. At last, I could not only watch and pretend, I could interact with space in the closest way that will ever be possible for me.
And you ask why I play space sims? - Like Sir Edmund Hillary, because they are there