This is surely a candidate both for the longest and coolest time lapse ever.

The Crab Nebula, or M1, is the expanding remains of a supernova that exploded in the year 1054. I have assembled 5 images that span at least 110 years, possibly more. I have then adjusted the luminosity and contrast so that the images would match as closely as possible and I have used the Hubble image for the color component of all 5 images in the animation. It is interesting to note the bright star up to the right that has moved by quite a distance. Its proper motion is about 0.25 arc seconds/year.

Image 1 was taken at the Lick observatory at the end of the 19th or the beginning of the 20th century.
Image 2 was taken with the 200-inch Hale telescope in 1950.
*Image 3 is a POSSII-Red plate from 1990.
Image 4 is the renowned Hubble image photographed in the year 2000.
Image 5 was take by Adam Block/Mount Lemmon SkyCenter/University of Arizona with a 32-inch telescope in 2012.
110 Years Expansion Of Crab Nebula

Taken by Peter Rosén on March 29, 2017 @ Centra Stockholm, Sweden

http://spaceweathergallery.com/indiv_upload.php?upload_id=134317
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