It would be fun to have corporations build space stations, ostensibly for technological benefits, but not disclosing details, so that your question would remain unanswered inside the story.
I've heard you can make LEDs slightly brighter. I don't think that would cause it, but it does give some idea that this is plausible.
3Lumifer
You're writing fiction, make it up :-) Off the top of my head, metals and alloys crystallize differently in microgravity. It's also easy to make perfect spheres. I'm sure that googling microgravity technology will give you further leads.
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