4chan's worksafe GIF board– a treasure trove of excellent content before it hits the social media tracts –has a great thread of space GIFs up now. I've selected a few of the best here.
I like it: celebritygoogly.com. Above, Wil Wheaton. Say the editors of this fine site, "To submit a picture, just post it on your tumblr and tag it 'celebritygoogly'." (via badastronomer)
Above, "Dixon crossing Niagara below the Great Cantilever Bridge," U.S.A., 1895-1903. And you can make your own, with Stereogranimator, a new project from
NYPL Labs. Stereogranimator is " a tool for transforming historical stereographs from The New York Public Library's vast collections into shareable 3D web formats."
Mike Guppy's "Selected" project is a series of fine-art images as animated GIFs in which the principal subject has been removed and replaced by a "marching-ants"-style selection border similar to the ones you'd see in GIMP or Photoshop.