M1 expanding over the decades animation (real images)

Hi, I've just put together an animation of M1 The Crab Nebula from a
few images taken by Palomar over ~30-50 year span (see the rapidly
moving star too!)

http://setisociety.org/m1-30-50-ds12rb.GIF

As many of you know, M1 was a supernova witnessed by Chinese and Arab
astronomers in 1054. What we see today has expanded since then to 11
light years wide and is expanding at a rate of 1500 kilometers per
second (or roughly 1/200th the speed of light) which evidently is fast
enough to show significant change over a 30-50 year period.

I made the image by first stacking a red and blue image from the first
Palomar Sky Survey taken between 1945-1955 in Registax 4, then I
stacked a red and blue image from the second Sky Survey taken between
1984-1999, then I cleaned both stacks up in Adobe PhotoDeluxe and then
animated them with GIF Construction Set Professional.

Best regards, Jason H.