How many light years is Earth away from the closest outer edge of the supermassive black hole in Sagittarius A* at the center of the Milky Way? I don't mean the distance to the center of the galaxy, but to the point in the black hole's circumference where it is closest to us.

  • $\begingroup$ en.wikipedia.org/wiki/Sagittarius_A* $\endgroup$
    – Py-ser
    Commented Aug 26, 2014 at 6:28
  • $\begingroup$ I've looked at that link but I didn't find this info there; could you point me specifically to where on the page that can be found? $\endgroup$
    – seijitsu
    Commented Aug 26, 2014 at 8:48
  • $\begingroup$ Copy the link, do not just click on it: the * is not included in the link, and it send to a wrong page. $\endgroup$
    – Py-ser
    Commented Aug 26, 2014 at 9:01

1 Answer 1


As @Py-ser already said, there is the very clear information about that, although his link correctly is here.

As we can read there, the distance of this is around 25000 light years, with a precision of 1400 light years.

Normally, the size of most galaxies is around some ten thousands of light years. Compared to the black holes, their size (the diameter of their event horizon) is some kilometers (stellar black holes) or some astronomical units (some millions - hundred millions of kilometers).

Even the size of the event horizon of the greatest known black hole is around the size of the solar system, which is around some thousandth of light years.

You don't need to ask, "how far we are from the nearest edge of Sagittarius A*", you can simply ask "how far we are from Sagittarius A".

  • 1
    $\begingroup$ +1 but according to en.wikipedia.org/wiki/TON_618 the Schwarzschild radius (even horizon radius) of the most massive black holes is not about thousands of light years but about 1300 AU, which is just about one light week. $\endgroup$
    – Pere
    Commented Jul 4, 2019 at 11:39

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .