Recent content by student1307

On a similar note, I am looking for a list of planetoids, and I am interested in their masses. I found a comprehensive databases at http://www.cfa.harvard.edu/iau/lists/MPLists.html (at IAU Minor Planet Center). All these databases, contain orbital parameters, magnitudes etc...but apparently no...

I understand the issue of geometric perspective and apparent size. I am talking about the other MW having smaller (lineal, not angular) radius as measured from Earth. And why rotating more slowly?

Ah So when I am sitting here, my Milky Way has mass M, radius R, angular momentum L etc. If I warp speed to the other(which runs away at some significant velocity), it would be identical. But When I look from here, I observe it as being redshifted (for sure), with smaller radius? but same mass...

Thank you, Does this mean that gravity forces inside the fast moving galaxy are stronger, because masses are the same, but the galaxy for a lack of better word is smaller?

Student here, please forgive... I have a question about relativistic mass in galaxies. Is the mass of far away galaxies affected by expansion of universe? That is: Is mass of a far away galaxy is different for observer there compared to the observer here? Let's say there is a galaxy identical...