Oh, I know.

To paraphrase Office Space:

Let me ask you something. Where you work, does anyone ever tell you to “think different?”

No. No, man. Shit, no, man. I believe you’d get your ass kicked sayin’ something like that, man.

I had my glasses on, and it still took DrSteveBrule’s comment plus about 30 more seconds before I got it smh

The distinction between a noun modified by an adjective or noun adjunct and a simple compound noun in English is not well defined. You can absolutely call space an adjective in this case.

It’s an adjective?

(Q: What kind of billionaires? A: Space billionaires!)