Lightyears doesn't measure time, it measures distance.
We know speed = Light travels at 1 Lightyear per Year (doh - well its defined that way heh) and distance: 600 Lightyears.
Therefore we can measure time. Speed x Time = Distance. Therefore Time = Distance/Speed = 600 Lightyears / 1Lightyear/Year = 600 Years.
Means a photon takes 600years to travel from Beetlejuice to where your eye can observe it, therefore anything you do observe happened 600 years in the past already.
i.e., If it blew up 595 years ago, we won't find out for another 5 years, but then we WILL see it LOL

I think I will take a closer look at the eye damage from the supernova later this afternoon. There could be something to learn in there, actually.
Whenever i have another eye-exam i'll make sure to ask the doctor about it, just to see the WT* look on his/her face LOL.
"Oh and btw Doc, when Beetlejuice goes Supernova; will it be safe to look at or can it damage my eye"?
