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Hubble has been observing targets like Messier 4, a globular cluster that is thought to hold a black hole with a mass around 800 times that of the sun.
Source: https://www.digitaltrends.com/space/hubble-intermediate-black-holes/
In an image recently taken by the Hubble Space Telescope, a proliferation of stars in the globular cluster Terzan 12 shine through interstellar gas and dust, making the entire image glow with activity.
Source: https://gizmodo.com/thousands-stars-shine-hubble-image-terzan-12-1850813769