Other galaxies, including our near-neighbor, the Andromeda, contain black holes hundreds of times more massive.
Preliminary results from the team have uncovered five other galaxies which may have similarly large black holes.
FORBES: Astronomers Find One Of The Biggest Supermassive Black Holes Yet
No supernovae have been observed in our own galaxy since 1604, but astronomers have seen many supernovae in other galaxies since.
But if they originate in other galaxies, thousands of times farther away, they would have to be the brightest objects in the universe.
Deciding whether the Milky Way has gorged on other galaxies, or has merely snacked now and then, will take a lot more careful sifting through its guts.
Now, our telescopes and other measuring devices can see other galaxies, supernovae, and back all the way to the beginning of the universe, 13.7 billion years ago.
At the moment it is not feasible to dedicate all the observing time on a six- or eight-metre telescope to search for exploding stars known as supernovae in other galaxies.
And every tunnel only took her to dozens of other tunnels, some of which went on for miles, and ended in points of light so distant and pale they were like stars in other galaxies.
"We compared what you see in these galaxies with what you see in the field galaxy population, other galaxies at the same epoch and distance, and there is a stark difference - far more star formation and black hole growth, " the Cambridge University scientist and Royal Society research fellow explained to the BBC News website.
BBC: NEWS | Science/Nature | Deepest X-rays tell merger story
The list of top discoveries made with Hubble reads like the hit parade of astronomy: a mysterious new "dark energy" causing the accelerating expansion of the universe, distances to other galaxies, the supermassive black holes at their centers, the age of the universe, planet formation around other stars, searches for signs of extraterrestrial life -- and the list goes on.
That is, if galaxies formed in part from accretion of other small galaxies.
FORBES: Astronomers Confirm Milky Way's Most Distant Stellar Stream
Dr Majewski and his colleagues are now looking at other parts of the halo to see whether they contain worms too, and if so, whether these can be traced to other satellite galaxies of the Milky Way.
The focus will not be on capturing images of interesting galaxies or other objects, that will come later this year.
ENGADGET: DECam: Gazing deep into the final frontier in search of dark energy
Dark matter is invisible, yet its presence is felt by the immense gravitational tug it exerts on stars, galaxies and other cosmic bodies.
That interaction increased the size of NGC 6872, and also produced new star forming regions where stars much younger than the other stars in the two galaxies are now being born.
If you're successful, you get to become an intergalactic colonizer, using your UFO to terraform other planets, solar systems and galaxies.
"The detection of a binary black hole supports the idea that black holes can grow to enormous masses in the centres of galaxies by merging with other black holes, " said Komossa.
Hubble's successor, the James Webb Space Telescope -- designed to reveal the first galaxies ever formed in the universe and to study other planetary systems -- could far surpass Hubble's discoveries.
Even though the suite of instruments for the E-ELT has yet to be finalized, ESO astronomer Joe Liske says the telescope will make observing time for cosmology, nearby galaxies, solar system studies and the burgeoning list of planets now known to circle other stars.
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