The other is an even bigger black hole 53.7 million light years away in another galaxy, M87.
Through the technique of Very Long Baseline Interferometry (VLBI), which links radio dishes across the globe to create an Earth-sized interferometer, nearby super-massive black holes could be "photographed", says the program's official website. Sheperd S Doeleman, EHT project director, said: "We have taken the first picture of a black hole".
Researchers' data showed the black hole at the heart of Messier 87 (M87), a galaxy within the Virgo cluster located about 55 million light-years from Earth.
More than 13 billion years after they formed, the light that was released to create these distant massive black holes is now reaching our telescopes.
The picture shows the black hole having a dark center, encircled by a bright orange and yellow ring spreading outward.
Using a global network of telescopes to see "the unseeable", an worldwide scientific team on Wednesday announced a milestone in astrophysics - the first-ever photo of a black hole - in an achievement that validated a pillar of science put forward by Albert Einstein more than a century ago.
Scientists will be "staring down the pipes of eternity" if, as expected, the first image of a black hole is released this week.
"You have all this energy stored in the black hole".
Data from the Event Horizon Telescope will be made public so scientists can verify the researcher's results.
What you're seeing in the image above is not technically the black hole itself - the singularity in the center is unobservable by any known means because signals can not return after crossing the event horizon boundary.
Black holes, phenomenally dense celestial entities, are extraordinarily hard to observe by their very nature despite their great mass. But the most important part of this photo is where there is no light.
The light you see here is what's called the accretion disk. This black hole is actually a supermassive black hole.
The supermassive black hole, known as a quasar, is growing so fast it can devour a mass the size of the sun every two days.