Image Information

Thanks to Paul Mortfield for pointing out that there are a number of quasars behind NGC 3628.   The circle outlines the more distant quasar in the FOV.  It has a redshift of 2.15.  Others can be found here.  Thanks to Fred Ringwald for providing interesting details as to "how far away" a redshift of 2.15 actually is.  Fred's comments are as follows, "I just did the calculation, and I find that a redshift of z = 2.15 corresponds to seeing the object the way it was 10.6 billion years ago, which was during the first 3.1 billion years of the age of the Universe. This corresponds to a distance of 18.1 billion light-years.  Notice that at such great distances, a light-travel time of 10.6 billion years doesn't imply a distance of 10.6 billion light-years, because the Universe has expanded significantly since the light left the quasar. There's also the non-zero cosmological constant to deal with. A nice primer for how to do calculations like this is here."

Thanks Paul, thanks Fred for pointing out some interesting science in this image.