You'll probably have to use emoji for everything, e.g. "🌌" for outer space and "🌊" for the ocean. :)

I would have suggested to try a monospace webfont with emoji support, but so far my search hasn't yielded a single one with consistent character width. (Fun fact: entering an emoji into the Google Fonts text preview breaks the preview.)

there is one here https://github.com/jslegers/emoji-icon-font

That's good to know given the spotty emoji support, but this font doesn't contain any latin characters, right? Which means that you again end up with a mixture of fonts.

use "em quad" or U+2001 &#8193. I'll put one here between these letter "x". x x