The black hole at the heart of our Milky Way

This year, we were able to present the first image of the "shadow" of the black hole at the center of our own galaxy, the Milky Way. It is the result of years of data analysis, which began in 2017 with the Event Horizon Telescope and resulted in the first image of such a black hole in the galaxy Messier 87 in 2019. Once again, over 30 employees from all departments of the institute were involved. This image is also a scientific breakthrough. But what makes it special? Why was the data analysis much more challenging than in the case of M87?