In 2019, EHT published the first image of the SMBH at the center of M87 galaxy using (low energy with long wavelength) radio light waves by combining multiple telescopes around our planet using a technique called radio interferometry. This SMBH is 6,5 billion times the mass of our sun and is situated 55 million light-years away from us.
The #Messier 87 SMBH is a thousand times more massive than the SMBH at the center of our own milky way galaxy. So it's diameter or it's event horizon sphere is also a thousand times bigger than Sagitarious A* too. M87 is also a thousand times further away from us than our galactic center which means that they appear roughly the same size on our sky.
While the whole solar system can fit inside the event horizon sphere of #M87, the orbit of mercury fits inside the event horizon sphere of the SMBH at our galactic center.
In 2022, EHT published a second image of Sagitarius A* the black hole at the center of our milky way galaxy. This SMBH is 4 million times the mass of our sun and is located around 27'000 light years away from us. Its event horizon which is sphere at the heart of a black hole has a diameter the size of Mercury's orbit around the sun approximately 116 million km.
