I found a reference to this from a NASA site - I found it really quite enlightening.
htwins.net/scale2/
The referencing NASA site:-
heasarc.gsfc.nasa.gov/docs/cosmic/
The difference in sizes of stars hit me - I new there were great differences - but I didn't really realise just how big some stars are.
I suspect that many will get reward from this.
After you hit START it takes a few seconds to kick in - note at any time you can click on an object and it gives you some info on that subject.
Number on the bottom right is the scale in metres.
You can use the wheel of the mouse to zoom in and out - or you can use left and right arrow.
I enjoyed it.
Mark C.
  