Stashed in: Futurama, gifs, awesome, Stars!, Explosions!, Time Lapse!
Reminds me of this bit from Futurama:
From the Reddit comments:
Apparently the radius of the nebula is about 16 arc-seconds (or was in April 2002), and it's 20,000 light-years away. So its radius is sin(16 arc-seconds) * 20,000 light-years = 89 light-years.