[dr_lew]

What makes this system worth studying is the fact that Schwarzschild radius around the supermassive black hole extends about the same distance as the orbit of Mercury.

...

The particular black hole at the core of the Milky Way has the mass of about four million Suns, experts say.

If we believe the first fact, which is stated without qualification, we don't need experts to tell us the second fact, which is entirely equivalent to it, according to the definition of the Schwarzschild radius.

[skinkinthegrass]

If we believe the first fact, which is stated..

thanks, for the interesting post / thread...
oh! I love FR.