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If someone had built such an object, say 10,000 light years away, what would it look like to us?

nothing for 10,000 years - however long ago they built it.

I read this as such dry humor, I have to ask if you are English.

Texan

but aren't stars varying extremely in size?

> but aren't stars varying extremely in size?

Woosh.

A star is a fusion reactor using only gravity for containment.

Well, they're only just barely contained. Things spew out radiation like nobody's business.