A star is probably visibledetected by its radiation but, Ask an Expert

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A star is probably visible/detected by it's radiation. But that star may or may not belong to our own galaxy yet news reports speak of detecting a star/nova in a distant galaxy.

How does one determine whether the star she/he views belongs to Milky Way, or some other galaxy or is galactic orphan? Is it merely a matter of the distance to that star?

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