More specifically, how does a name like SDSS J010013.02+280225.8 (one of the most massive black holes) come about. What do the numbers mean?
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In that particular instance, “SDSS” refers to the [Sloan Digital Sky Survey
](https://en.wikipedia.org/wiki/Sloan_Digital_Sky_Survey) and the two numbers are the object’s ascension and declination. It’s sort of like latitude and longitude but for objects in the sky.
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