Dear Mr. Petry,

I understand that you have discussed some of your questions already with my colleague Dr. Fabio Bresolin in or after his class. Dr. Bresolin is co-author of this paper as I am. I suggest that you contact him directly should you have more questions.

With kind regards

Rolf Kudritzki

The Center of Mass (total mass)?
The Center of Number (total stars)?
The Center of Luminance (observable)?
The Center of Modal Bunchiness (‘arms’)?
The Center of Magellanic-local dark matter?
The Center of Eclipsing Binaries (eight)?
The Center of Standard-Candle Moments?

Is that today–or–to where it was 163,000 years ago?
Does that account for Stellar Aberration (galaxy scale)?
Is that accounting for 163,000 years of Hubble Expansion?

And just technically speaking–What, is the “geometrical center” looking broadside? (It’s not in the dictionary like ‘geometric mean’ is for lengthwise from our point), And, How significant is it when taking only eight cases?

(I mean–from the standpoint of walking away from this article with a reference number ‘163,000 lightyears’?)

So–What’s the distance to the center of our Milky Way galaxy, Or is that still less-accurate itself…?

Ray.