That it’s zoomed in as much as it is despite being so far away (at the heart of another galaxy), enough to show shapes of light emissions in enough detail to confirm or deny theories and formulas, to a greater degree than had been done before.

It’s a big deal because it’s the first direct image of a black hole ever.

It’s never been done before

Because up to now you only had either a mathematical formula or an artist’s drawing

Imagine you had a kid somewhere but the only connection to them was an occasional email or a caricature. Then one day you get a picture.

Here’s good video that shows stars orbiting around the black hole in the center of our galaxy.
Remember, those balls are stars STARS!!!
Black hole.

A camera works by exposing film (or a medium that does the same thing as film) to light entering the lens. If a black hole absorbs light, then a picture can’t be taken of it under normal circumstances because it emits no light. So actually getting a picture of one is quite substantial!

I once read a theory that every galaxy has a black hole at its center.

GAs guys. Thanks.