Planes, helicopters, you name it. I like them all, and like to fly them in the simulator too (usually on VATSIM), most of the time without crashing...

They're everywhere nowadays, and absolutely amazing! In my free time I like to program them or play on them. You can check if one of mine is alive here🥧

The stars, the galaxies, and everything else. All fascinating! Fotographing those objects is quite fun as well.

Substance goes boom, and rocket goes up. Cool isn't it? That might be a little simplified, but still cool. They frequently take satellites, which are fun to receive as well (assuming the setup didn't fell appart again).

The pistons go up and down, and the vehicle goes forward or backwards. How can you not find that cool?