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A more correct title is "Galaxy brightens and scientists suspect it might be due to the galaxy's black hole"

There is no direct evidence the black hole is doing anything - it's just the only theory we have.

I mean, when you put it that way black holes as a whole are a mere theory. A theory used to explain gravitational fluctuations and the odd lack of mass in the universe (which still wasn't fully solved and are currently dabbling with dark matter to further fine tune results).

Except we've actually photographed a black hole: https://science.nasa.gov/resource/first-image-of-a-black-hol...

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