Hubble's 4-year timelapse of the V838 Monocerotis stellar explosion gif
Adam Rifkin stashed this in The Universe
Stashed in: Futurama, gifs, awesome, Stars!, Explosions!, Time Lapse!
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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.
3:52 PM Nov 05 2014