Re: Spacetime
Arguments about style are the stuff of holy wars. Nobody wins, everyone suffers, and not one participant in a thousand has the faintest idea what they are fighting about.
There is a coherent rule that acronyms that are pronounced as words (like NASA, NATO, SPAM) are written with an initial capital only, like a proper name. It's not inherently "wrong", nor self-evidently any worse to write them that way. Get over it.