Since I was a kid I've liked painting 'spacescapes' of places that only exist in my imagination. Here's are a couple examples:

    This is a picture of a planet orbiting a star of the Pleiades cluster being passed by an asteroid. Other stars of the Pleiades, which is an open cluster of hot, young, blue-white stars, are in the background.

        I modelled this one after the planet Pluto, which is why it's so cold-looking.

    I like looking at pictures like this by painters who really know what they're doing, such as Chesley Bonestell. Usually scientists make the best spacescape artists since they don't do things like hang a rising crescent moon in the sky pointing in the wrong direction.